Windows Identity of the currently logged in user

[C# Programming]

Hi,
I have created an application which runs on a Web Server. This web server in-turn runs as a windows service.
This windows service's account is configured as follows

ServiceProcessInstaller serviceProcessInstaller = new ServiceProcessInstaller();

serviceProcessInstaller.Account = ServiceAccount.LocalSystem;

Now I have a scenario in which I have to access a database and execute queries in it which needs the currently logged in user. The problem is that whenever I try to use

System.Security.Principal.WindowsIdentity.GetCurrent().Name

I am getting the name as "SYSTEM" and not the logged in user's name. And I know that this is because the service is run at the system level.

I can change the ServiceAccount as

serviceProcessInstaller.Account = ServiceAccount.User

I can now get the currently logged in user name. But, this requires the user to enter his user name and password when the service is being installed and I do not want that to happen.

Hence is there any other way in which I can get the WindowsIdentity object of the currently logged in user? Please suggest..

Thanks,
ramz_g