C#做的一個日期控件,用控件數組做的

C#做的一個日期控件,用控件數組做的

 

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace CustTool
{
    /// <summary>
    /// Form1 的摘要描述。
    /// </summary>
    public class Calendar : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button btnprev;
        private System.Windows.Forms.Button btnnext;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Label lblmonth;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Button button3;
        private System.Windows.Forms.Button button4;
        private System.Windows.Forms.Button button5;
        private System.Windows.Forms.Button button6;
        private System.Windows.Forms.Button button7;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Button button8;
        private System.Windows.Forms.Button button9;
        private System.Windows.Forms.Button button10;
        private System.Windows.Forms.Button button11;
        private System.Windows.Forms.Button button12;
        private System.Windows.Forms.Button button13;
        private System.Windows.Forms.Button button14;
        private System.Windows.Forms.Button button15;
        private System.Windows.Forms.Button button16;
        private System.Windows.Forms.Button button17;
        private System.Windows.Forms.Button button18;
        private System.Windows.Forms.Button button19;
        private System.Windows.Forms.Button button20;
        private System.Windows.Forms.Button button21;
        private System.Windows.Forms.Button button22;
        private System.Windows.Forms.Button button23;
        private System.Windows.Forms.Button button24;
        private System.Windows.Forms.Button button25;
        private System.Windows.Forms.Button button26;
        private System.Windows.Forms.Button button27;
        private System.Windows.Forms.Button button28;
        private System.Windows.Forms.Button button29;
        private System.Windows.Forms.Button button30;
        private System.Windows.Forms.Button button31;
        private System.Windows.Forms.Button button32;
        private System.Windows.Forms.Button button33;
        private System.Windows.Forms.Button button34;
        private System.Windows.Forms.Button button35;
        private System.Windows.Forms.Button button36;
        private System.Windows.Forms.Button button37;
        private System.Windows.Forms.Button button38;
        private System.Windows.Forms.Button button39;
        private System.Windows.Forms.Button button40;
        private System.Windows.Forms.Button button41;
        private System.Windows.Forms.Button button42;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.Label label5;
        private System.Windows.Forms.Label label6;
        private System.Windows.Forms.Label label7;
        /// <summary>
        /// 設計工具所需的變數。
        /// </summary>
        private System.ComponentModel.Container components = null;
        private System.Windows.Forms.Label today;

        private int year;
        private int month;
        private int day;
        private Button[] myButton = new Button[42];

        public Calendar()
        {
            //
            // Windows Form 設計工具支援的必要項
            //
            InitializeComponent();

            this.btnprev.Click +=  new System.EventHandler(this.btnprev_Click);
            this.btnnext.Click +=  new System.EventHandler(this.btnnext_Click);
            myButton[0] = button1;
            myButton[1] = button2;
            myButton[2] = button3;
            myButton[3] = button4;
            myButton[4] = button5;
            myButton[5] = button6;
            myButton[6] = button7;
            myButton[7] = button8;
            myButton[8] = button9;
            myButton[9] = button10;
            myButton[10] = button11;
            myButton[11] = button12;
            myButton[12] = button13;
            myButton[13] = button14;
            myButton[14] = button15;
            myButton[15] = button16;
            myButton[16] = button17;
            myButton[17] = button18;
            myButton[18] = button19;
            myButton[19] = button20;
            myButton[20] = button21;
            myButton[21] = button22;
            myButton[22] = button23;
            myButton[23] = button24;
            myButton[24] = button25;
            myButton[25] = button26;
            myButton[26] = button27;
            myButton[27] = button28;
            myButton[28] = button29;
            myButton[29] = button30;
            myButton[30] = button31;
            myButton[31] = button32;
            myButton[32] = button33;
            myButton[33] = button34;
            myButton[34] = button35;
            myButton[35] = button36;
            myButton[36] = button37;
            myButton[37] = button38;
            myButton[38] = button39;
            myButton[39] = button40;
            myButton[40] = button41;
            myButton[41] = button42;

            //
            // TODO: 在 InitializeComponent 呼叫之後加入任何建構函式程式碼
            //
        }

        /// <summary>
        /// 清除任何使用中的資源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form 設計工具產生的程式碼
        /// <summary>
        /// 此為設計工具支援所必須的方法 - 請勿使用程式碼編輯器修改
        /// 這個方法的內容。
        /// </summary>
        private void InitializeComponent()
        {
            this.btnprev = new System.Windows.Forms.Button();
            this.btnnext = new System.Windows.Forms.Button();
            this.button1 = new System.Windows.Forms.Button();
            this.lblmonth = new System.Windows.Forms.Label();
            this.button2 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.button4 = new System.Windows.Forms.Button();
            this.button5 = new System.Windows.Forms.Button();
            this.button6 = new System.Windows.Forms.Button();
            this.button7 = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.button8 = new System.Windows.Forms.Button();
            this.button9 = new System.Windows.Forms.Button();
            this.button10 = new System.Windows.Forms.Button();
            this.button11 = new System.Windows.Forms.Button();
            this.button12 = new System.Windows.Forms.Button();
            this.button13 = new System.Windows.Forms.Button();
            this.button14 = new System.Windows.Forms.Button();
            this.button15 = new System.Windows.Forms.Button();
            this.button16 = new System.Windows.Forms.Button();
            this.button17 = new System.Windows.Forms.Button();
            this.button18 = new System.Windows.Forms.Button();
            this.button19 = new System.Windows.Forms.Button();
            this.button20 = new System.Windows.Forms.Button();
            this.button21 = new System.Windows.Forms.Button();
            this.button22 = new System.Windows.Forms.Button();
            this.button23 = new System.Windows.Forms.Button();
            this.button24 = new System.Windows.Forms.Button();
            this.button25 = new System.Windows.Forms.Button();
            this.button26 = new System.Windows.Forms.Button();
            this.button27 = new System.Windows.Forms.Button();
            this.button28 = new System.Windows.Forms.Button();
            this.button29 = new System.Windows.Forms.Button();
            this.button30 = new System.Windows.Forms.Button();
            this.button31 = new System.Windows.Forms.Button();
            this.button32 = new System.Windows.Forms.Button();
            this.button33 = new System.Windows.Forms.Button();
            this.button34 = new System.Windows.Forms.Button();
            this.button35 = new System.Windows.Forms.Button();
            this.button36 = new System.Windows.Forms.Button();
            this.button37 = new System.Windows.Forms.Button();
            this.button38 = new System.Windows.Forms.Button();
            this.button39 = new System.Windows.Forms.Button();
            this.button40 = new System.Windows.Forms.Button();
            this.button41 = new System.Windows.Forms.Button();
            this.button42 = new System.Windows.Forms.Button();
            this.label3 = new System.Windows.Forms.Label();
            this.label4 = new System.Windows.Forms.Label();
            this.label5 = new System.Windows.Forms.Label();
            this.label6 = new System.Windows.Forms.Label();
            this.label7 = new System.Windows.Forms.Label();
            this.today = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // btnprev
            // 
            this.btnprev.Location = new System.Drawing.Point(16, 48);
            this.btnprev.Name = "btnprev";
            this.btnprev.Size = new System.Drawing.Size(32, 23);
            this.btnprev.TabIndex = 3;
            this.btnprev.Text = "<<";
            // 
            // btnnext
            // 
            this.btnnext.Location = new System.Drawing.Point(488, 48);
            this.btnnext.Name = "btnnext";
            this.btnnext.Size = new System.Drawing.Size(32, 23);
            this.btnnext.TabIndex = 9;
            this.btnnext.Text = ">>";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(8, 120);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 40);
            this.button1.TabIndex = 10;
            this.button1.Text = "button1";
            // 
            // lblmonth
            // 
            this.lblmonth.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.lblmonth.Location = new System.Drawing.Point(48, 48);
            this.lblmonth.Name = "lblmonth";
            this.lblmonth.Size = new System.Drawing.Size(440, 23);
            this.lblmonth.TabIndex = 11;
            this.lblmonth.Text = "月份";
            this.lblmonth.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(83, 120);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(75, 40);
            this.button2.TabIndex = 12;
            this.button2.Text = "button2";
            // 
            // button3
            // 
            this.button3.Location = new System.Drawing.Point(158, 120);
            this.button3.Name = "button3";
            this.button3.Size = new System.Drawing.Size(75, 40);
            this.button3.TabIndex = 13;
            this.button3.Text = "button3";
            // 
            // button4
            // 
            this.button4.Location = new System.Drawing.Point(233, 120);
            this.button4.Name = "button4";
            this.button4.Size = new System.Drawing.Size(75, 40);
            this.button4.TabIndex = 14;
            this.button4.Text = "button4";
            // 
            // button5
            // 
            this.button5.Location = new System.Drawing.Point(308, 120);
            this.button5.Name = "button5";
            this.button5.Size = new System.Drawing.Size(75, 40);
            this.button5.TabIndex = 15;
            this.button5.Text = "button5";
            // 
            // button6
            // 
            this.button6.Location = new System.Drawing.Point(383, 120);
            this.button6.Name = "button6";
            this.button6.Size = new System.Drawing.Size(75, 40);
            this.button6.TabIndex = 16;
            this.button6.Text = "button6";
            // 
            // button7
            // 
            this.button7.BackColor = System.Drawing.SystemColors.Control;
            this.button7.Location = new System.Drawing.Point(458, 120);
            this.button7.Name = "button7";
            this.button7.Size = new System.Drawing.Size(75, 40);
            this.button7.TabIndex = 17;
            this.button7.Text = "button7";
            // 
            // label1
            // 
            this.label1.Location = new System.Drawing.Point(16, 88);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(48, 23);
            this.label1.TabIndex = 18;
            this.label1.Text = "星期日";
            // 
            // label2
            // 
            this.label2.Location = new System.Drawing.Point(92, 88);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(48, 23);
            this.label2.TabIndex = 19;
            this.label2.Text = "星期一";
            // 
            // button8
            // 
            this.button8.Location = new System.Drawing.Point(8, 160);
            this.button8.Name = "button8";
            this.button8.Size = new System.Drawing.Size(75, 40);
            this.button8.TabIndex = 20;
            this.button8.Text = "button8";
            // 
            // button9
            // 
            this.button9.Location = new System.Drawing.Point(83, 160);
            this.button9.Name = "button9";
            this.button9.Size = new System.Drawing.Size(75, 40);
            this.button9.TabIndex = 21;
            this.button9.Text = "button9";
            // 
            // button10
            // 
            this.button10.Location = new System.Drawing.Point(158, 160);
            this.button10.Name = "button10";
            this.button10.Size = new System.Drawing.Size(75, 40);
            this.button10.TabIndex = 22;
            this.button10.Text = "button10";
            // 
            // button11
            // 
            this.button11.Location = new System.Drawing.Point(233, 160);
            this.button11.Name = "button11";
            this.button11.Size = new System.Drawing.Size(75, 40);
            this.button11.TabIndex = 23;
            this.button11.Text = "button11";
            // 
            // button12
            // 
            this.button12.Location = new System.Drawing.Point(308, 160);
            this.button12.Name = "button12";
            this.button12.Size = new System.Drawing.Size(75, 40);
            this.button12.TabIndex = 24;
            this.button12.Text = "button12";
            // 
            // button13
            // 
            this.button13.Location = new System.Drawing.Point(383, 160);
            this.button13.Name = "button13";
            this.button13.Size = new System.Drawing.Size(75, 40);
            this.button13.TabIndex = 25;
            this.button13.Text = "button13";
            // 
            // button14
            // 
            this.button14.BackColor = System.Drawing.SystemColors.Control;
            this.button14.Location = new System.Drawing.Point(458, 160);
            this.button14.Name = "button14";
            this.button14.Size = new System.Drawing.Size(75, 40);
            this.button14.TabIndex = 26;
            this.button14.Text = "button14";
            // 
            // button15
            // 
            this.button15.Location = new System.Drawing.Point(8, 200);
            this.button15.Name = "button15";
            this.button15.Size = new System.Drawing.Size(75, 40);
            this.button15.TabIndex = 27;
            this.button15.Text = "button15";
            // 
            // button16
            // 
            this.button16.Location = new System.Drawing.Point(83, 200);
            this.button16.Name = "button16";
            this.button16.Size = new System.Drawing.Size(75, 40);
            this.button16.TabIndex = 28;
            this.button16.Text = "button16";
            // 
            // button17
            // 
            this.button17.Location = new System.Drawing.Point(158, 200);
            this.button17.Name = "button17";
            this.button17.Size = new System.Drawing.Size(75, 40);
            this.button17.TabIndex = 29;
            this.button17.Text = "button17";
            // 
            // button18
            // 
            this.button18.Location = new System.Drawing.Point(233, 200);
            this.button18.Name = "button18";
            this.button18.Size = new System.Drawing.Size(75, 40);
            this.button18.TabIndex = 30;
            this.button18.Text = "button18";
            // 
            // button19
            // 
            this.button19.Location = new System.Drawing.Point(308, 200);
            this.button19.Name = "button19";
            this.button19.Size = new System.Drawing.Size(75, 40);
            this.button19.TabIndex = 31;
            this.button19.Text = "button19";
            // 
            // button20
            // 
            this.button20.Location = new System.Drawing.Point(383, 200);
            this.button20.Name = "button20";
            this.button20.Size = new System.Drawing.Size(75, 40);
            this.button20.TabIndex = 32;
            this.button20.Text = "button20";
            // 
            // button21
            // 
            this.button21.Location = new System.Drawing.Point(458, 200);
            this.button21.Name = "button21";
            this.button21.Size = new System.Drawing.Size(75, 40);
            this.button21.TabIndex = 33;
            this.button21.Text = "button21";
            // 
            // button22
            // 
            this.button22.Location = new System.Drawing.Point(8, 240);
            this.button22.Name = "button22";
            this.button22.Size = new System.Drawing.Size(75, 40);
            this.button22.TabIndex = 34;
            this.button22.Text = "button22";
            // 
            // button23
            // 
            this.button23.Location = new System.Drawing.Point(83, 240);
            this.button23.Name = "button23";
            this.button23.Size = new System.Drawing.Size(75, 40);
            this.button23.TabIndex = 35;
            this.button23.Text = "button23";
            // 
            // button24
            // 
            this.button24.Location = new System.Drawing.Point(158, 240);
            this.button24.Name = "button24";
            this.button24.Size = new System.Drawing.Size(75, 40);
            this.button24.TabIndex = 36;
            this.button24.Text = "button24";
            // 
            // button25
            // 
            this.button25.Location = new System.Drawing.Point(233, 240);
            this.button25.Name = "button25";
            this.button25.Size = new System.Drawing.Size(75, 40);
            this.button25.TabIndex = 37;
            this.button25.Text = "button25";
            // 
            // button26
            // 
            this.button26.Location = new System.Drawing.Point(308, 240);
            this.button26.Name = "button26";
            this.button26.Size = new System.Drawing.Size(75, 40);
            this.button26.TabIndex = 38;
            this.button26.Text = "button26";
            // 
            // button27
            // 
            this.button27.Location = new System.Drawing.Point(383, 240);
            this.button27.Name = "button27";
            this.button27.Size = new System.Drawing.Size(75, 40);
            this.button27.TabIndex = 39;
            this.button27.Text = "button27";
            // 
            // button28
            // 
            this.button28.Location = new System.Drawing.Point(458, 240);
            this.button28.Name = "button28";
            this.button28.Size = new System.Drawing.Size(75, 40);
            this.button28.TabIndex = 40;
            this.button28.Text = "button28";
            // 
            // button29
            // 
            this.button29.Location = new System.Drawing.Point(8, 280);
            this.button29.Name = "button29";
            this.button29.Size = new System.Drawing.Size(75, 40);
            this.button29.TabIndex = 41;
            this.button29.Text = "button29";
            // 
            // button30
            // 
            this.button30.Location = new System.Drawing.Point(83, 280);
            this.button30.Name = "button30";
            this.button30.Size = new System.Drawing.Size(75, 40);
            this.button30.TabIndex = 42;
            this.button30.Text = "button30";
            // 
            // button31
            // 
            this.button31.Location = new System.Drawing.Point(158, 280);
            this.button31.Name = "button31";
            this.button31.Size = new System.Drawing.Size(75, 40);
            this.button31.TabIndex = 43;
            this.button31.Text = "button31";
            // 
            // button32
            // 
            this.button32.Location = new System.Drawing.Point(233, 280);
            this.button32.Name = "button32";
            this.button32.Size = new System.Drawing.Size(75, 40);
            this.button32.TabIndex = 44;
            this.button32.Text = "button32";
            // 
            // button33
            // 
            this.button33.Location = new System.Drawing.Point(308, 280);
            this.button33.Name = "button33";
            this.button33.Size = new System.Drawing.Size(75, 40);
            this.button33.TabIndex = 45;
            this.button33.Text = "button33";
            // 
            // button34
            // 
            this.button34.Location = new System.Drawing.Point(383, 280);
            this.button34.Name = "button34";
            this.button34.Size = new System.Drawing.Size(75, 40);
            this.button34.TabIndex = 46;
            this.button34.Text = "button34";
            // 
            // button35
            // 
            this.button35.Location = new System.Drawing.Point(458, 280);
            this.button35.Name = "button35";
            this.button35.Size = new System.Drawing.Size(75, 40);
            this.button35.TabIndex = 47;
            this.button35.Text = "button35";
            // 
            // button36
            // 
            this.button36.Location = new System.Drawing.Point(8, 320);
            this.button36.Name = "button36";
            this.button36.Size = new System.Drawing.Size(75, 40);
            this.button36.TabIndex = 48;
            this.button36.Text = "button36";
            // 
            // button37
            // 
            this.button37.Location = new System.Drawing.Point(83, 320);
            this.button37.Name = "button37";
            this.button37.Size = new System.Drawing.Size(75, 40);
            this.button37.TabIndex = 49;
            this.button37.Text = "button37";
            // 
            // button38
            // 
            this.button38.Location = new System.Drawing.Point(158, 320);
            this.button38.Name = "button38";
            this.button38.Size = new System.Drawing.Size(75, 40);
            this.button38.TabIndex = 50;
            this.button38.Text = "button38";
            // 
            // button39
            // 
            this.button39.Location = new System.Drawing.Point(233, 320);
            this.button39.Name = "button39";
            this.button39.Size = new System.Drawing.Size(75, 40);
            this.button39.TabIndex = 51;
            this.button39.Text = "button39";
            // 
            // button40
            // 
            this.button40.Location = new System.Drawing.Point(308, 320);
            this.button40.Name = "button40";
            this.button40.Size = new System.Drawing.Size(75, 40);
            this.button40.TabIndex = 52;
            this.button40.Text = "button40";
            // 
            // button41
            // 
            this.button41.Location = new System.Drawing.Point(383, 320);
            this.button41.Name = "button41";
            this.button41.Size = new System.Drawing.Size(75, 40);
            this.button41.TabIndex = 53;
            this.button41.Text = "button41";
            // 
            // button42
            // 
            this.button42.Location = new System.Drawing.Point(458, 320);
            this.button42.Name = "button42";
            this.button42.Size = new System.Drawing.Size(75, 40);
            this.button42.TabIndex = 54;
            this.button42.Text = "button42";
            // 
            // label3
            // 
            this.label3.Location = new System.Drawing.Point(168, 88);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(48, 23);
            this.label3.TabIndex = 55;
            this.label3.Text = "星期二";
            // 
            // label4
            // 
            this.label4.Location = new System.Drawing.Point(244, 88);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(48, 23);
            this.label4.TabIndex = 56;
            this.label4.Text = "星期三";
            // 
            // label5
            // 
            this.label5.Location = new System.Drawing.Point(320, 88);
            this.label5.Name = "label5";
            this.label5.Size = new System.Drawing.Size(48, 23);
            this.label5.TabIndex = 57;
            this.label5.Text = "星期四";
            // 
            // label6
            // 
            this.label6.Location = new System.Drawing.Point(396, 88);
            this.label6.Name = "label6";
            this.label6.Size = new System.Drawing.Size(48, 23);
            this.label6.TabIndex = 58;
            this.label6.Text = "星期五";
            // 
            // label7
            // 
            this.label7.Location = new System.Drawing.Point(472, 88);
            this.label7.Name = "label7";
            this.label7.Size = new System.Drawing.Size(48, 23);
            this.label7.TabIndex = 59;
            this.label7.Text = "星期六";
            // 
            // today
            // 
            this.today.Location = new System.Drawing.Point(48, 376);
            this.today.Name = "today";
            this.today.Size = new System.Drawing.Size(280, 23);
            this.today.TabIndex = 60;
            this.today.Text = "today";
            // 
            // Calendar
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 15);
            this.ClientSize = new System.Drawing.Size(552, 405);
            this.Controls.Add(this.today);
            this.Controls.Add(this.label7);
            this.Controls.Add(this.label6);
            this.Controls.Add(this.label5);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.button42);
            this.Controls.Add(this.button41);
            this.Controls.Add(this.button40);
            this.Controls.Add(this.button39);
            this.Controls.Add(this.button38);
            this.Controls.Add(this.button37);
            this.Controls.Add(this.button36);
            this.Controls.Add(this.button35);
            this.Controls.Add(this.button34);
            this.Controls.Add(this.button33);
            this.Controls.Add(this.button32);
            this.Controls.Add(this.button31);
            this.Controls.Add(this.button30);
            this.Controls.Add(this.button29);
            this.Controls.Add(this.button28);
            this.Controls.Add(this.button27);
            this.Controls.Add(this.button26);
            this.Controls.Add(this.button25);
            this.Controls.Add(this.button24);
            this.Controls.Add(this.button23);
            this.Controls.Add(this.button22);
            this.Controls.Add(this.button21);
            this.Controls.Add(this.button20);
            this.Controls.Add(this.button19);
            this.Controls.Add(this.button18);
            this.Controls.Add(this.button17);
            this.Controls.Add(this.button16);
            this.Controls.Add(this.button15);
            this.Controls.Add(this.button14);
            this.Controls.Add(this.button13);
            this.Controls.Add(this.button12);
            this.Controls.Add(this.button11);
            this.Controls.Add(this.button10);
            this.Controls.Add(this.button9);
            this.Controls.Add(this.button8);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.button7);
            this.Controls.Add(this.button6);
            this.Controls.Add(this.button5);
            this.Controls.Add(this.button4);
            this.Controls.Add(this.button3);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.lblmonth);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.btnnext);
            this.Controls.Add(this.btnprev);
            this.Name = "Calendar";
            this.Text = "Calendar";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }
        #endregion

        private int DaysInMonth (int Year,int Month)
        {
            if(Month==2)
            {
                if(IsLeapYear(Year))
                {    
                    return 29;
                }
                return 28;
            }
            if(Month==4||Month==6||Month==9||Month==11)
            {
                return 30;
            }
            return 31;

        }//DateTime.DaysInMonth(
        private bool IsLeapYear(int Year)
        {
            if(Year%4==0&&Year%100!=0||Year%400==0)
                return true;
            else 
                return false;
        }


        private int DayOfWeek(DateTime DateTime)
        {
            int i;
            switch(DateTime.DayOfWeek)
            {
                case System.DayOfWeek.Monday:
                    i=1;
                    break;
                case System.DayOfWeek.Tuesday:
                    i=2;
                    break;
                case System.DayOfWeek.Wednesday:
                    i=3;
                    break;
                case System.DayOfWeek.Thursday:
                    i=4;
                    break;
                case System.DayOfWeek.Friday:
                    i=5;
                    break;
                case System.DayOfWeek.Saturday:
                    i=6;
                    break;
                case System.DayOfWeek.Sunday:
                    i=0;
                    break;
                default:
                    i=-1;
                    break;
            }
            return i;
        }

        private void InitLbl(int Year,int Month)
        {
            this.lblmonth.Text=Year.ToString()+"年"+Month.ToString()+"月";
            this.lblmonth.Refresh();
        }

        private void InitBtn(int Year,int Month)
        {
            System.DateTime firstday=Convert.ToDateTime(Year.ToString()+"/"+Month.ToString()+"/"+Convert.ToString(1));

            //中間
            int iweek=this.DayOfWeek(firstday);
            int currMonthDay=DaysInMonth(Year,Month);
            int j=0;//按鈕上顯示的文字
            for(int i=iweek;i<iweek+currMonthDay;i++)
            {
                j++;
                myButton[i].Text=j.ToString();
                myButton[i].Click +=  new System.EventHandler(this.button_Click);
                myButton[i].BackColor=Color.LightSeaGreen;
            }

            //前面        
            int prevMonthDay=DaysInMonth(Year,Month-1);
            int m=prevMonthDay;//按鈕上顯示的文字
            for(int i=iweek-1;i>=0;i--)
            {
                myButton[i].Text=m.ToString();
                myButton[i].Click +=  new System.EventHandler(this.btnprev_Click);
                myButton[i].BackColor=Color.Silver;
                m--;
            }


            //後面
            int k=0;//按鈕上顯示的文字
            for(int i=iweek+currMonthDay;i<42;i++)
            {
                k++;
                myButton[i].Text=k.ToString();
                myButton[i].Click +=  new System.EventHandler(this.btnnext_Click);
                myButton[i].BackColor=Color.Silver;
            }

            //
            //day=System.DateTime.Now.Day;
            //myButton[iweek-1+day].Select();
        }
        private void button_Click(object sender, System.EventArgs e)
        {
            Button box = (Button)sender;
            MessageBox.Show("you selected"+this.year.ToString()+"/"+this.month.ToString()+"/"+box.Text.ToString(),"date" ,MessageBoxButtons.OK);
            
        }

        private void btnprev_Click(object sender, System.EventArgs e)
        {
            unInitBtn();
            this.month--;
            if(month==0)
            {
                this.year--;
                this.month=12;
            }
            InitLbl(this.year,this.month);
            InitBtn(this.year,this.month);;

        }
        private void btnnext_Click(object sender, System.EventArgs e)
        {
            unInitBtn();
            this.month++;
            if(this.month==13)
            {
                this.year++;
                this.month=1;
            }
            InitLbl(this.year,this.month);
            InitBtn(this.year,this.month);;
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            System.DateTime currtime=System.DateTime.Now;
            this.year=currtime.Year;
            this.month=currtime.Month;
            this.day=currtime.Day;
            
            InitLbl(this.year,this.month);
            InitBtn(this.year,this.month);

            this.today.Text="今天是:"+currtime.ToShortDateString();


        }

        private void unInitBtn()
        {
            System.DateTime firstday=Convert.ToDateTime(this.year.ToString()+"/"+this.month.ToString()+"/"+Convert.ToString(1));
        
            //中間
            int iweek=this.DayOfWeek(firstday);
            int currMonthDay=DaysInMonth(this.year,this.month);
            int j=0;
            for(int i=iweek;i<iweek+currMonthDay;i++)
            {
                j++;
                myButton[i].Text=j.ToString();
                myButton[i].Click -=  new System.EventHandler(this.button_Click);
                myButton[i].BackColor=Color.Coral;
            }

            //前面
            int prevmonthday=DaysInMonth(this.year,this.month-1);
            int m=prevmonthday;
            for(int i=iweek-1;i>=0;i--)
            {
                myButton[i].Text=m.ToString();
                myButton[i].Click -=  new System.EventHandler(this.btnprev_Click);
                myButton[i].BackColor=Color.Silver;
                m--;

            }

            //後面
            int k=0;
            for(int i=iweek+currMonthDay;i<42;i++)
            {
                k++;
                myButton[i].Text=k.ToString();
                myButton[i].Click -=  new System.EventHandler(this.btnnext_Click);
                myButton[i].BackColor=Color.Silver;
            }
        }



    }
}