private async void cbCategoryItem_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
List <MyHealthCheckService.Items> lstItems = new List <MyHealthCheckService.Items>();
lstItems = await objWCFservice.GetItemsByItemAsync(cbCategoryItem.SelectedItem.ToString());
MyHealthCheckService.Items obj = new MyHealthCheckService.Items {
CategoryId = 0, ItemsId = 0, ItemValue = "Select an Item", QuantityValue = "0"
};
lstItems.Insert(0, obj);
cbItem.ItemsSource = lstItems.Select(l => l.ItemValue).ToList();
cbItem.SelectedIndex = 0;
}
