SQL Server Express permissions

Fix for exceptions like these:
"CREATE DATABASE permission denied in database 'master'",
"EXECUTE permission denied on object "
"SELECT permission denied on object"

Asp.NET uses the NETWORK SERVICE account (for Windows Server 2003) and ASPNET user for Windows XP. If we use windows authetincation for using sql express we need to add these users as sql server logins:
SQL Server manager -> Security -> Logins -> add "NT AUTHORITY\NETWORK SERVICE" or ASPNET
Then click on the properties menu of the login and make the login dbcreator. This will fix the first of the exceptions above. Then with User Mapping setting we can add permissions explicitly to the desired database -> dbowner gives all needed permission.