private void Button_Click(object sender, RoutedEventArgs e) { ServiceReference2.Service1Client client = new ServiceReference2.Service1Client(); string retStr; /*string returnString; * returnString = client.GetDataAsync("test").Result.ToString(); * SetMyText(returnString); */ retStr = client.MoveFilesAsync("C:\\temp\\a.txt", "C:\\temp_destination\\a.txt").Result.ToString(); SetMyText(retStr); }