param(
  [Parameter(Mandatory = $true)]
  [string]$Source,

  [string]$LogName = "Application"
)

$ErrorActionPreference = "Stop"

if (-not [System.Diagnostics.EventLog]::SourceExists($Source)) {
  New-EventLog -LogName $LogName -Source $Source
  Write-Host "Event Source '$Source' wurde in '$LogName' angelegt."
}
else {
  Write-Host "Event Source '$Source' existiert bereits."
}