hoe get AsyncResult of Controller method using WebClient OpenWriteAsync

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ASP.NET

Silverlight

MVC

Hi , i have a MVC Controller for handling calls and a silver light client
At Silver Light client i am using WebClient's OpenWriteAsync method to upload a file
At Controller a have a methood which saves the file and returns some json string but how do i get that returned value.


@ Client :

Public void Somethod {
  Uri luri = new Uri(fileUploadSvcBaseUri);
  client.OpenWriteCompleted += client_OpenWriteCompleted;
  client.OpenWriteAsync(luri, "POST", fileStream);
}

void client_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
        {
            try
            {
                if (e.Cancelled || e.Error != null)
                {
                    return;
                }
                var data = e.UserState as Stream;
                data.CopyTo(e.Result);
            }
            finally
            {
                ((WebClient)sender).OpenWriteCompleted -= client_OpenWriteCompleted;
                e.Result.Close();

            }
        }

@Controller:

Public ActionResult CallingMethod()
{

 //// file save logic
return Json(path @ which File is saved );

}

how do i get this json string @ client_OpenWriteCompleted