Granting access to SQL Server database from ASP.Net application

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I've set up a login page for a .NET web application but when I try to log one of the users on my database in I get this error.\[quote\] Cannot open database "SampleLaundrySystem" requested by the login. The login failed. Login failed for user\[/quote\]After doing some research I found I ran this query in an attempt to give myself access to the server\[code\]EXEC sp_grantlogin 'MyMachineName\ASPNET' /* Give the ASPNET account access to DB*/ EXEC sp_grantdbaccess 'MyMachineName\ASPNET' /* Give the ASPNET account full privileges to DB*/ EXEC sp_addrolemember 'db_owner', 'MyMachineName\ASPNET'\[/code\]The above still didn't work and I'm getting an error saying the 'MyMachineName' was not found.I need help on how to get this sorted or pointers to what I'm doing wrong. Please find below my connection string:\[code\]<add name="SampleName" connectionString="Server=localhost\SqlExpress;Database=SampleLaundrySystem;Integrated Security=True" providerName="System.Data.SqlClient" />\[/code\]Thanks in advance for everything.