How do I achieve this:-
When user types character like 'abcd' and then '>'(an invalid character for my application), I want to set the text back to 'abcd'. Better if we can cancel the input itself as we do in winforms application. This should happen when user is typing and not on a click of button.

I want this to be applied on all text boxes in my web page. This will be easy if the solution is jQuery based. May be something which will start like this.
$("input[type='text']")