How to allow only ABCD in textbox using c#

Question

I want to validate textbox only enter capital ABCD or small abcd how to do it in  c#.

Midhun T P · Answer

Hi Please try below code- Regex regex = new Regex(@^[a-dA-D]*$); if (!regex.Match(Textbox1.Text).Success) { //does not match your pattern }

Upendra Pratap Shahi · Answer

Where you want to validate this in client side or server side. If you want to do on client side use Jquery or JavaScript if on server side then use c#. Where you have to need for validation?