I have a textbox in a form where I need to enter the number of users. I need to make sure the person enters a number on that field. How can I validate that field?
<td class="NavyBold">Number of Users
(if multiple users):</td>
<td><asp:textbox id="txtusernumber" Runat="server" Width="50Px" MaxLength="4"></asp:textbox></td>