How to Allow letters,numbers,some special characters only?

Question

i want to allow letters,numbers and some special characters in textbox(,.\-_)this special characters only or throw error message how to do it.

Answer 1

Hi ,

 

check this

 

for 3-Tier architecture

 

http://www.dotnetfunda.com/articles/show/71/3-tier-architecture-in-aspnet-with-csharp