单击窗体在单击处插入控件 - asp.net 教程-

        private void Form1_MouseDown(object sender, MouseEventArgs e)

        {  //设定他的名称和Button属性，以及产生的位置

            Button bnt = new Button();

            bnt.Left = e.X;

            bnt.Top = e.Y;

            bnt.Name = "Button" + intCount.ToString();

            bnt.Text = "Button" + intCount.ToString();

            this.Controls.Add(bnt);

            intCount++;

        }