Thank you for contacting us.
The error from your first post is usually present when the type of the scheduler property does not match the type of the mapped column in the database. This can be solved by using a ConvertCallback
methods. However, I am not sure if this is necessary in your case or exactly how should the convert methods be implemented.
The second issue also appears to be a matter of converting between data types. However I cannot provide you with any concrete directions, since I am not aware of the complete scenario and the database schema. Therefore, I would like to kindly ask you to open a new support ticket and send us a sample project and a sample database that demonstrate your scenario. This will let me investigate it and provide you with a solution.
Looking forward to hearing from you.
the Telerik team