private async void search_click(object sender, RoutedEventArgs e)
 {
        MobileServiceCollection<UserData, UserData> data;
        IMobileServiceTable<UserData> dataTable = App.MobileService.GetTable<UserData>();

        try
        {
            showBlock.Text = "searching.....";
            statusBar.IsIndeterminate = true;
            searchButton.IsEnabled = false;
            if (searchBox.Text != "")
            {
                tempUnamePhone = await App.MobileService.GetTable<UserData>().Where(x => x.uname == searchBox.Text || x.phone == searchBox.Text).ToListAsync();
               data = await dataTable.Where(x => x.uname == searchBox.Text).Select(x=>x.fname).ToCollectionAsync();


            }
            if (tempUnamePhone.Count != 0)
            {
                showBlock.Text = "item found"+fname;
                statusBar.IsIndeterminate = false;
                searchButton.IsEnabled = true;
            }
            else
            {

                showBlock.Text = "no match found";

                statusBar.IsIndeterminate = false;
                searchButton.IsEnabled = true;
            }
        }
        catch (Exception )
        {
            var m = new MessageDialog("Network error..close the app and try again" ).ShowAsync();
        }

    }
    }

var fname = string.Empty;
if (searchBox.Text != "")
        {
            tempUnamePhone = await App.MobileService.GetTable<UserData>().Where(x => x.uname == searchBox.Text || x.phone == searchBox.Text).ToListAsync();
            fname =tempUnamePhone.Where(x => x.uname == searchBox.Text).FirstOrDefault() == null ? string.Empty : await dataTable.Where(x => x.uname == searchBox.Text).First().fname;

if (tempUnamePhone.Count != 0)
        {
            showBlock.Text = "item found" + fname;
            statusBar.IsIndeterminate = false;
            searchButton.IsEnabled = true;
        }
        else
        {

            showBlock.Text = "no match found";

            statusBar.IsIndeterminate = false;
            searchButton.IsEnabled = true;
        }