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I find recursion complicated You can use a while loop:

private string SearchDocument(Document doc)
{
 while (doc != null) 
 {
 if (!string.IsNullOrEmpty(doc.Ordnungsbegriff))
 {
 return doc.Ordnungsbegriff;
 }
 doc = doc.ParentDocument;
 }
 return null;
}

Edit: As a further point - it's better not to mix languages in your code: Ordnungsbegriff should be Keyword (according to Google).

I find recursion complicated You can use a while loop:

private string SearchDocument(Document doc)
{
 while (doc != null) 
 {
 if (!string.IsNullOrEmpty(doc.Ordnungsbegriff))
 {
 return doc.Ordnungsbegriff;
 }
 doc = doc.ParentDocument;
 }
 return null;
}

Edit: As a further point - it's better not to mix languages in your code: Ordnungsbegriff should be Keyword (according to Google).

I find recursion complicated You can use a while loop:

private string SearchDocument(Document doc)
{
 while (doc != null) 
 {
 if (!string.IsNullOrEmpty(doc.Ordnungsbegriff))
 {
 return doc.Ordnungsbegriff;
 }
 doc = doc.ParentDocument;
 }
 return null;
}

I find recursion complicated You can use a while loop:

private string SearchDocument(Document doc)
{
 while (doc != null) 
 {
 if (!string.IsNullOrEmpty(doc.Ordnungsbegriff))
 {
 return doc.Ordnungsbegriff;
 }
 doc = doc.ParentDocument;
 }
 return null;
}

Edit: As a further point - it's better not to mix languages in your code: Ordnungsbegriff should be Keyword (according to Google).