Question

Following discuss Problem to pass the result to the caller for asynchronous httpWebRequest I tried to created an event of type Action

public event Action<string> ResponseResult;

but Silverlight refuses event keyword: it says expect class, delegate, …

Answer 1

You are defining the event in the wrong place. If you have your Helper class (reference the original post) then you need to declare the event inside this class:

public class Helper
{
     public event Action<string> ResponseResult;

     // rest of code...
}