SecurityException when create a EnvetLog

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.NET

hello I'm trying to create log source at the windows event viewer
I use this code just to open source :

System.Diagnostics.EventLog.CreateEventSource("LiorSprot.com", "LiorSprot");

and I get this the exception :

"Source was not found, but could not search some or all event logs. Logs not accessible: Security."

I run the asp applictaion in local host.

The problem is probably that I have no permission. But... how do I give permission? Maybe run administrator mode?

please help :)