select all text in text box

Question

Hello All

 

i have windows App

some text boxs

i tab between textbox by this code

 

 

private void AstTxt_KeyDown(object sender, KeyEventArgs e)

  {

     if (e.KeyCode == Keys.Enter)

      {

         AltTxt.Focus();

       } 

   }

 

but i want when go next text box

 select data in this textbox not delete it