Question

What is the best way to validate WebMethod params .
I guess this not best practice:

[WebMethod]
        public string HelloWorld(String sayHi)
        {
            if (sayHi.Equals(""))
            {
                throw new Exception("User not provided");
            }
            return "String OK";
        }

Thanks

Answer 1

How about this:

You should use string not String.

[WebMethod]
public string HelloWorld(string sayHi)
{
   if (string.IsNullOrEmpty(sayHi)                
       throw new ArgumentException("User not provided");

   return "String OK";
}