I'm bit new to SQL server Express edition. I'v create few databases using sql server management studio. (always i login as windows authentication mode). Those databases are working properly with VB.net. In those databases i've never used username and passwords. But now i want to login as 'SQL Server authentication' mode. But the problem is i dont know the default username and password. Then i read few fourms and got an idea about it. It is given instruction like this.
1. Login as windows authentication mode
2. Goto server properties.
3. Then security settings.
4. Change to mix option.
5. The default username and password is 'sa'
Then i login as sql server authentication mode. But still I can log to sql server authentication mode. It is displayed a error message incorrect username or password.
Please give a proper instruction to find my default username and password.