Allow Only Numeric Values in Asp.Net Textbox Using JavaScript

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    <html>
   <head>
   <script language="Javascript">
      
       function isNumOnly(evt) {
           var charCode = (evt.which) ? evt.which : event.keyCode
           if (charCode > 31 && (charCode < 48 || charCode > 57))
               return false;

           return true;
       }
  
   </script>
   </head>
   <body>
      <asp:TextBox ID="txtno" Text="" onkeydown="return isNumOnly(event)"  runat="server"></asp:TextBox>

   </body>
</html>

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