Connecting To SQL Server Exrpress - Using Web.config

Hello,
 So I am just getting started with .NET,
 
I am using Visual Web Developer 2005 Express and
SQL Server 2005 Express on XP Media Center (same as XP Pro)
 
ASP.NET version 2.0.????
Anyways, I am having the time of my life figuring out how  to connect to SQL Server from within my C#, as follows,
(where settings.connection  = ".SQLEXPRESS;Database=MyDatabase;Integrated Security=SSPI;" in my web.config)
SqlConnection conn = new SqlConnection(Settings.Connection);
        SqlDataReader rdr = null;

        try
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand("select * from mytable", conn);
            rdr = cmd.ExecuteReader();
            while (rdr.Read())
            {
                Console.WriteLine(rdr[0]);
            }
        }
 
the above yields unspeakable errors, namely
 
<font color="red"><b>Cannot open database requested by login. login failed for user 'computername/SQLEXPRESS'</b></font> , etc
AND
<font color="red"><b>A connection was successfully established with the server, but then an error occurred during the login process. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.)</b></font>
 If you have ANY information on the suspect, please, please report it to me. Greatly appreciated!
Thanks, Cam