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;
    }  
}