How to return only text message error from a stored procedure with out Exception?

CREATE PROC PROCNAME AS BEGIN DECLARE @ErrorMessage NVARCHAR(MAX) BEGIN TRY Insert into dtls..... --This line will return a Foreign Key exception but i don't need it to be shown when i am executing SP from .net END TRY BEGIN CATCH SELECT @ErrorMessage = ERROR_MESSAGE() --This message alone should be diplayed. RAISERROR < ...