private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            var a = this.DataContext as AvailableSponsorship;

            if (a != null)
            {
                if (a.IsValidate())
                {
                    if (AvailableSponsorship.InsertData(a))
                    {
                        MyMessage.InsertMessage();
                        DialogResult = true;
                    }
                }
            }
        }