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I am using ASP.Net with ADO.Net Entity Data Model. I use this for add record:
userEntity.AddToUSERs(newUser);
In this case, can ADO.Net Entity Data Model validate unique user and display error message?
No. Entity Framework does not handle Unique Keys. You have to manually handle these cases.
One possible solution would be to catch the exception when
SaveChangesis called and check the message of theExceptionand extract which unique key is violated and then using that add aModelStateerror with the relevant property name.