Normal buttons require ALT-key to be pressed. If you don't mind this, name the buttons
and trap "number"-buttons
If you do not want ALT-key to be used, you have to trap KeyUp or similar event and use some other control instead of Button control.

I assume you have your click event sub proceedure running, to add another event for a button say "button1" you have to make sure you have enable its 'tabstop' property and then you can add another event sub proceedure.

However for your calculator, when the tabstop gets to the 'btn1' button all the user has to do is to press the "enter key".

This is in simple context, however you may have to implement threading for complex scenario where you need responses. (My opinion)

I am leaving you with some code snippet for your review, it may help.

[CODE syntax=vb]

Private Sub btn1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles btn1.KeyPress

Dim keyasc As Short

If keyasc >= System.Windows.Forms.Keys.D1 And keyasc <= System.Windows.Forms.Keys.D9 Then
txtDisplay.Text = Val(btn1.Text)
Exit Sub
Else
MessageBox.Show("Error key pressed")

End If

End Sub

[/CODE]

thanks Teme64
thanks for sharing your code with us i think it will defiantly useful for someone.good job..