遍历页面上所有TextBox控件并给它的Enabled赋值为false

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

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页面调用方法：

   foreach (Control control1 in this.Form.Controls)
            {
                FindSelecedControl(control1);
            }