Cannot open user default database, login fails

hi:
I got the problem, which lots of people might encounter before.

In my case, I use login control and sqlexpress to build a login page.
when password & user name were entered. It gave me:
"Cannot open user default database, login fails"

The solution given by msdn is:

SQL Server 2005

You can use the sqlcmd utility to change the default database in SQL Server 2005. To do this, follow these steps:

1.Click Start, click Run, type cmd, and then press ENTER. 2.Use one of the following methods, depending on the kind of authentication that the SQL Server login uses:

?If

the SQL Server login uses Microsoft Windows authentication to connect

to the instance, type the following at the command prompt, and then

press ENTER:

sqlcmd –E -S InstanceName –d master

?If

the SQL Server login uses SQL Server authentication to connect to the

instance, type the following at the command prompt, and then press

ENTER:

sqlcmd -S InstanceName -d master -U SQLLogin -P Password

Note InstanceName is a placeholder for the name of the SQL Server 2005 instance to which you are connecting. SQLLogin is a placeholder for the SQL Server login whose default database has been dropped. Password is a placeholder for the SQL Server login password.3.At the sqlcmd prompt, type the following, and then press ENTER:

ALTER LOGIN SQLLogin WITH DEFAULT_DATABASE = AvailDBName

Note AvailDBName is a placeholder for the name of the existing database that can be accessed by the SQL Server login in the instance.4.At the sqlcmd prompt, type GO, and then press ENTER.

I wonder what are InstanceName, SQLLogin & AvailDBName. It would be nice if someone can give me a specific example, since I am not sure how to type them in a command line. :)

You're in the wrong forum. Try here: http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=84&SiteID=1

-Jamie