The ErrorCodes relate to specific TRIM MessageIds.  I don't recall a way to translate an ErrorCode to a human friendly message, but if you are trying to handle specific exceptions and you know the MessageIds associated with those exceptions, then you can use the SDK method TrimApplicationBase.ToErrorCode(msgId) to get the ErrorCode thrown in that situation, and check for it in your exception handler.

Generally the Message and InnerException properties will give you ample detail if you just want to know what went wrong.

As an aside I can recall that I have previously experienced issues with the Database.ConnectAs(user, pass) method.

I've swapped across to using the Database.SetAuthenticationCredentials(user, pass) method

Try the below:

var database = new Database();
database.Id = "ID";
database.WorkgroupServerName = "serverName";
database.AuthenticationMethod = ClientAuthenticationMechanism.ExplicitWindows;
database.SetAuthenticationCredentials("user","pass");
database.Connect();

If this doesn't work, it may give you an alternate error message that you would be able to troubleshoot through

-Scotty

thanks