Catch SQL raise error in C#

Question

I generate the raise error in SQL procedure:

RAISERROR(\'Already exist\',-10,-10)

but I can not catch it using the following co

Answer 1

Use an error code within 11-16, or just use 16 for a "general" case.

RAISERROR('Already exists',16,1)

Why? Here's my summary of https://docs.microsoft.com/en-us/sql/relational-databases/errors-events/database-engine-error-severities?view=sql-server-2017:

SQL RAISERROR -> C#:

• 0-10 = fyi*
• 11-16 = you can fix it**
• 17-19 = get admin help
• 20-24 = definitely get admin help***

*(don't throw anything) ┬──┬

**(16 = general)

***(fatal error)