protected void ButtonLogIn_Click(object sender, EventArgs e)
        {
            var client     = new AuthServiceClient();
            var adminModel = new AdminModel
            {
                AdminUserName = TextBoxLoginUsername.Text,
                AdminPassword = TextBoxLoginPassword.Text
            };
            bool result = Convert.ToBoolean(client.AuthenticateAdmin(adminModel));

            if (result)
            {
                Session["AdminUser"] = "******" + TextBoxLoginUsername.Text;
                Response.Redirect("AddCarPage.aspx");
            }
            else
            {
                MessageBox.Show("Please provide a valid username and password");
            }
        }