EventLogEntry.UserName Property    
Definition
Important
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Gets the name of the user who is responsible for this event.
public:
 property System::String ^ UserName { System::String ^ get(); };public string UserName { get; }member this.UserName : stringPublic ReadOnly Property UserName As StringProperty Value
The security identifier (SID) that uniquely identifies a user or group.
Exceptions
Account information could not be obtained for the user's SID.
Remarks
This property is often blank for events in logs other than the Security log.