This topic demonstrates how to show a tooltip, we'll use a wijtooltip in this example, when an invalid character is entered into the C1InputMask control.

1. Right-click the C1InputMask control on your form and choose Properties to open the Visual Studio Properties window.
2. Next to the MaskFormat property, enter 00-000.
3. Next to the OnClientInvalidInput property, enter invalidInput.
4. Select the Source tab to open the source view.
5. In the .aspx source, enter the following script markup:
   

   To write code in Source View

   <script type="text/javascript">
       function invalidInput(e, data) {
           $(data.widget.element).wijtooltip({
               title: '\"' + data.char + '\" is invalid to mask ' + data.widget.options.mask,
               triggers: 'custom',
               showing: function () {
                   window.setTimeout(function () {
                       $(data.widget.element).wijtooltip('hide');
                   }, 3000);
               }
           });
           $(data.widget.element).wijtooltip('show');
       }
   </script>
   

When an invalid character is entered in the C1InputMask control, a tooltip appears, like in the following image: