Question

I want my TextBoxExtender to NOT allow a comma and a slash. How do I set it ? Using an escape sequence ?

Thanks.

Answer 1

I think you are looking for the InvalidChars Element. The FilteredTextBoxExtender can be set to filter either Valid or Invalid Characters.

   <ajaxToolkit:FilteredTextBoxExtender ID='MyId' runat='server'         TargetControlID='TextBoxName'                  FilterType='Custom'         FilterMode='InvalidChars'         InvalidChars='Your Charcters' /> 

Reference

EDIT no you can just add all your characters you want to exclude

InvalidChars='`~!@#$%^&*()_-+=[]{}:;',.<>/? '