编程遍历页面上所有TextBox控件并给它赋值为string.Empty？(webform&winform)

webform:

private void FindSelecedControl ( Control control ) { if ( control is Button ) { Button bt = ( Button )control; bt.Enabled = false; } else { for ( int i = 0; i < control.Controls.Count; i++ ) { FindSelecedControl ( control.Controls[ i ] ); } } }