USE MyDatabase
GO

-- Windows 2000 / XP
-- Replace "{servername}" with your SQL Server name

EXEC sp_grantlogin [{servername}\ASPNET] 
EXEC sp_grantdbaccess [{servername}\ASPNET], [NETAPP]

-- GRANT EXECUTE ON [ProcedureName] TO [NETAPP]
grant exec on [dbo].[usp_My_Procedure] TO NETAPP 
GO

-- Windows Server 2003
-- Info.

EXEC sp_grantlogin [NT AUTHORITY\NETWORK SERVICE]
EXEC sp_grantdbaccess [NT AUTHORITY\NETWORK SERVICE]

GRANT EXECUTE ON [ProcedureName] TO [NT AUTHORITY\NETWORK SERVICE]
GO