sending special characters to webservices problem iphone

My problem is with the special characters, i am trying to sen开发者_开发百科d one JSON string to services, in that string i am sending one string with special characters like "!@#$%^&*()_+!@#$%^&())^%%" but i am not getting the response from the server.

can any one help me on this.

Thanks in advance

Did you tried to encode your string ? I think this url will help you : encoding an NSString on iOS