title: How to use regular expression validator controller to check the input values in asp.net
body: <p>May i know how to use RegularExpressionValidator controller in Asp.net to check the Input value when is 0 . then show the error message ? Kindly advise</p>
  
  <pre><code> &lt;asp:RegularExpressionValidator id="Inv_QtyREV" runat="server" ErrorMessage=" Not allow input QTY is 0, please check again !!" ValidationExpression="([0])" ControlToValidate= "Inv_Qty" /&gt;
  </code></pre>