eg.TextBox tb1 = new TextBox();
tb1.Location = new Point(0,0);
tb1.Size = new Size(100,100);
tb1.Text = "hello TextBox";
this.Controls.Add(tb1);
tb1.Location = new Point(0,0);
tb1.Size = new Size(100,100);
tb1.Text = "hello TextBox";
this.Controls.Add(tb1);
http://www.chinabs.net/csharp/default.asp
窗体下,拉两个控件试试,
然后到InitializeComponent()里面看源代码