How do I add additional function to the radscheduler dialog box OK Button

[Dominic]

I want to add a check function to the scheduler dialog box OK BUTTON. How do I do that?

[Dess | Tech Support Engineer, Principal]

Hello, Dominic,

You can create a derivative of EditAppointmentDialog and override its ValidateInput method. It is triggered when the OK button is clicked. Hence, you can perform any additional code in the method.

Additional information about creating custom dialogs in RadScheduler is available in the following help articles:
https://docs.telerik.com/devtools/winforms/controls/scheduler/appointments-and-dialogs/adding-a-custom-field-to-the-editappointment-dialog 
https://docs.telerik.com/devtools/winforms/controls/scheduler/dialogs/editappointmentdialog 

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik

[Dominic]

Hi Dess, how do I exit the dialog box without saving if the condition is not met?

Please check my pic attachment part highlighted in RED. Thanks.

I tried "Exit Sub" but it still creates the appointment.

[Dess | Tech Support Engineer, Principal]

Dominic, the ApplySettingsToEvent method is called when the OK button is clicked. If you skip the base logic and just return in the if statement, the changes made on the dialog wouldn't be applied to the affected Appointment.