-- Need to visible or invisible the Field based on user role.
Currently you see the menu item and when a user clicks on it, they will get a message that rules do not allow this operation.
-- Need to send the value based on user role to database while saving.
There are global events triggered when you save a content item. You can access them though Global.asax - NewsManager.Executed and NewsManager.Executing.
All the best,
the Telerik team
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