Microsoft.Net，刘少盟

C#第一章笔记1.C#程序的框架  namespace 包名  { class 类名 {   static void Main(string[] args)  {   Console.WriteLine("Hello .net");   Con

//登录的判定；private void btnLogin_Click(object sender, EventArgs e)        {            //从app.config文件中获取节点的name属性为strcon的connectionString的值，也就是获取对应的连接字符串            string strcon=ConfigurationMa

从sql导出到txt  try                {                    SqlDataAdapter sdr = new SqlDataAdapter("select * from T_GRDA", con);                    DataSet ds = new DataSet();

From1 准备传值代码： Password pa = new Password();            pa.MdiParent = this;//声明 PassWord的父窗体是本窗体（ Form1）            pa.NaVa = NaVa;            pa.PaVa = PaVa;            pa.Show();Pa

当前选中项：TreeView.SelectedNode 增加顶级节点：TreeView.Nodes.Add("Key", "Text") 增加同级节点：TreeView.SelectedNode.Parent.Nodes.Add("Key", "Text") 增加子节点：TreeView.SelectedNode.Nodes.Add("Key", "Text") 全部展开：Tree

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using Sy