unique constraint

How do I catch a unique error constraint error on a try and catch block.....

say i want to trap a specific error like

if constraint_error then


end if
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i do it like this...

catch ex as exception

If Regex.IsMatch(ex.Message, "<ERROR MESSAGE TRAPPING FOR>") Then

do this
end if

There may be a better way out there, but this has always met my needs

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       Dim constraint_error As Boolean = True
            If constraint_error Then Throw New Exception(constraint_error.ToString)
        Catch ex As Exception
            Response.Write("#" & ex.ToString & "#")
        End Try
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