title: this operation is not supported in the wcf test client because it uses type system.object[]
body: <p>hi while running my wcf service it gives me error "this operation is not supported in the wcf test client because it uses type system.object[]"</p>
  
  <p><img src="https://i.stack.imgur.com/5Jshb.jpg" alt="enter image description here"></p>
  
  <p>i m trying to retrieve the running process list.</p>
  
  <pre><code>[ServiceBehavior(InstanceContextMode=InstanceContextMode.Single)]
      class Windows_processes_Service:IWindows_processes_Service
      {
          ArrayList RunningProcesses_Name = new ArrayList();
          public ArrayList GetRunningProcesses()
          {
              Process[] processlist = Process.GetProcesses();
              foreach (Process nme_processes in processlist)
              {
                  RunningProcesses_Name.Add(nme_processes.ProcessName.ToString());
              }
              return RunningProcesses_Name;
          }
      }
  </code></pre>