C# winfrom在Panel下面动态添加空间

 private void Form5_Load(object sender, EventArgs e)
        {
             for (int i = 0; i < 20; i++)

           {

               TextBox b = new TextBox();
             // Button b = new Button();

              b.Text = "" + i;
           
             b.SetBounds(p.X, p.Y, 184, 50);
             b.Font = new Font(b.Font.FontFamily, 25, b.Font.Style);

            //  b.Click += new System.EventHandler(ClickHandler);

               //b.MouseEnter += new System.EventHandler(MouseEnterHandler);

               // b.MouseHover += new System.EventHandler(MouseHoverHandler);

               //this.Controls.Add(b);在整个窗体下添加
              panel1.Controls.Add(b); //Panel下添加

               p.X += 200;

              if (p.X >= this.panel1.Width - 50)

                {

                  p.X = 0;

                   p.Y += 100;

              }

         }

        }