请编程遍历WinForm页面上所有TextBox控件并给它赋值为string.Empty？

foreach (System.Windows.Forms.Control control in this.Controls)

{

if (control is System.Windows.Forms.TextBox)

{

System.Windows.Forms.TextBox tb = (System.Windows.Forms.TextBox)control ; 

tb.Text = String.Empty ; }

}