error_message()

[Shrek]

I have a stored procedure that drops all constraints and indexes then rebuilds them.

some of if goes something like this...

WHILE @@fetch_status = 0
BEGIN
SET @SQL = 'ALTER TABLE ' + @TableName + ' DROP CONSTRAINT ' + @ObjectName
BEGIN TRY
EXEC (@SQL)
END TRY
BEGIN CATCH
INSERT INTO ##NonDropped VALUES('Constraint ' + @ObjectName + ' on table ' + @TableName, ERROR_MESSAGE())
END CATCH

all works fine.
What I want to do is improve the error messaging.
If I try to drop a non-existant constraint I would get an error

Msg 3728, Level 16, State 1, Line 1 'constraint_name' is not a constraint.
Msg 3727, Level 16, State 0, Line 1 Could not drop constraint. See previous errors.
All error messege does is return the last message, which is a bit meaningingless. I can't seem to find a way of getting the first message which would be more usefull.

Any pointers?