How can I identify all connection related exception types in an SqlException?

Question

I am writing a VB.net winforms application which connects to Sql server 2008. (C# answers also accepted)

I am trying to differentiate between any SqlExceptions related to the connection to the database and other SQL specific errors (such as incorrect syntax etc.)

I am using a try/catch around the connection like so:

Try
   //code to open the connection/access the DB/etc.
Catch ex As SqlException When ex.Number=???
   //Do stuff
End Try

I am presuming that checking the error code is the correct way to go. My issue is that there are a number of different error codes (i'm not sure how many) relating to the connection to the database. For example:

121 = Timeout (could be caused by disconnecting from the network).

53 = Could not connect (again, could be caused by not being connected to the network).

1326 = You are connected to the physical server machine but the Sql Server is not running.

And I am sure that there are many, many more. Do I have to check for each of these individually or is there a better way? If I have to check for them individually, is there a list of the connection related ones anywhere that I can refer to?

Answer 1

As @jdweng Suggested in comments, I added a try/catch block around just the query. So that if an exception occurred, it couldn't be anything else but connection related.

So simple! Thanks again.