private void button1_Click(object sender, EventArgs e)
        {
            int count = 5;   //查处来的个数
            for (int i = 0; i < count; i++)
            {
                TextBox tbox = new TextBox();   //用户控件
                tbox.Text = "查出来的数据";
                tbox.Location = new Point(30, i * tbox.Height);
                this.Controls.Add(tbox);
            }
        }