Welcome to the ASP.NET Core feedback portal. We’re happy you’re here! If you have feedback on how to improve the ASP.NET Core, we’d love to hear it!>
Thanks for joining our community and helping improve Syncfusion products!
Try to use the `isSlotAvaliable` method within the actionBegin event, and add or edit an event on Scheduler programmatically using "saveEvent" method, the event doesn't seems to change with newly provided values.
Refer the below sample for this issue,