Question

I have a customer provided database which is configured with multiple users. Each user has their own username/password etc, which are database logins for SQL Server.

In legacy software, the user is asked for their database and password which is then used to form a connectionstring in code.

I am tasked with replacing a lot of the database code for this, and I need a way of checking a username and password against the database quite quickly. At present, using Linq, if the password is incorrect I eventually get a System.Data.SqlClient.SqlException but this takes quite a while to actually throw (I assume a timeout?).

Does anybody know a good way that I can test my username/password combo against the database quickly?

Answer 1

You could try opening a connection through ADO, with a reduced timeout

 SqlConnection conn = new SqlConnection (yourconnectionstring + ";Connection Timeout=1;");          
 try
 { 
     conn.Open();
     conn.Close();
 }
 catch (SqlException ex)
 {
     if (ex.Number == 18456)
     {
          // invalid login
     }
 }

18456 is SQL Invalid login

The default connection timeout is 15 seconds.