Let the user press Ctrl-A to select all of the text in a TextBox in VB .NET When the TextBox's KeyPress event sees the Ctrl-A key code (1), it casts the event's sender into a TextBox and calls the TextBox's SelectAll method. The code then sets e.Handled to True to indicate that the character has been handled. This prevents the TextBox from beeping.

Textbox Select All.vbs

If e.KeyChar = Convert.ToChar(1) Then
        DirectCast(sender, TextBox).SelectAll()
        e.Handled = True
    End If

Thanks for the hint. Here's the code for Vb.NET 2017+:

If e.KeyChar = Convert.ToChar(1) Then
      TextBoxOmnyStatusOutput.SelectAll()
      e.Handled = True
End If