The easiest way is subscribing for UpdatedUser event of ManageUsers control inside OnInit of Sitefinity\Admin\CmsAdmin\Users.aspx.cs
. Then from ManageUsers.EditContainer you could access the controls inside the container and check the selected role. You should compare this role with the previously selected value and if there are different execute your logic against the database.
You could also use the UpdateingUser event which is called before UpdatedUser
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items