$EventSourceName = "Source Name"
if ([System.Diagnostics.EventLog]::SourceExists($EventSourceName) -eq $false) {
   Write-Host "Creating event source [$EventSourceName] on event log [Application]"
   [System.Diagnostics.EventLog]::CreateEventSource("$EventSourceName",'Application')
} else { Write-Host "Event source [$EventSourceName] is alread registered" }
