protected void btnlogin_Click(object sender, EventArgs e) { if (txtEmail.Text.Trim() == "") { Alert.Show("กรุณากรอก Email ด้วย !!!"); txtEmail.Focus(); return; } if (txtPassword.Text.Trim() == "") { Alert.Show("กรุณากรอก รหัสผ่าน ด้วย !!!"); txtPassword.Focus(); return; } FruitService service = new FruitService(); MemberFruit user = service.CheckLogin(txtEmail.Text.Trim() , txtPassword.Text.Trim()); if (user != null) { Session[SessionKey.USERLOGIN] = user; Response.Redirect("index.aspx"); } else { Session[SessionKey.USERLOGIN] = null; Response.Redirect("index.aspx"); } }