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

webForm:

foreach (Control control in this.Form.Controls)

        {

            if (control is System.Web.UI.WebControls.TextBox)

            {

                TextBox tb= (TextBox)control;

                tb.Text = ""; 

            }

        }

winform:

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 ;
}
}