Add Verification Field to Appointment

[shahab]

Dear dude
I want to add verification code to appointment when user want to insert new appointment get verification code and in edit for it should enter verification to allow editing. but when I add verification field to appointment table I got an error:
DataBinding: 'Telerik.Web.UI.Appointment' does not contain a property with the name 'Verification'.

[shahab]

I found an answer to add verificatio field:
            CustomAttributeNames="Verification"
            EnableCustomAttributeEditing="True"
But now I want to get Verification code from user before deleting appointment. I used RadWindows to get verification code. But I don not know how to compared entered verification code by user and stored verification code (in DataBase)

[shahab]

function OpenWnd(sender, eventArgs) {

          var Appointment = eventArgs.get_appointment();

          var verification = Appointment._attributes.getAttribute("Verification");

          ???

          eventArgs.set_cancel(true);

      }

I found this solution but I do not know how get verification from user to compare it

<telerik:RadScheduler runat="server" ID="PatientScheduler" Width="100%" Height="100%"
           CustomAttributeNames="Verification"
           EnableCustomAttributeEditing="True"
           OnClientAppointmentDeleting="OpenWnd">