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  <?xml version="1.0" encoding="utf-8" ?> 
- <Root>
  <titel Titel="Girokonto" Typ="" Kontoinhaber="" Kontonummer="" Bankleitzahl="" Kreditinstitut="" /> 
  <titel Titel="" Typ="" Kontoinhaber="" Kontonummer="" Bankleitzahl="" Kreditinstitut="" /> 
  </Root>                    

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      if(kontenliste.SelectedIndex!=-1){
        if(MessageBox.Show("Wollen sie das Konto wirklich entfernen?","Abfrage",MessageBoxButtons.YesNo,MessageBoxIcon.Question)==DialogResult.Yes){
          XmlDocument document = new XmlDocument();
          document.Load("konten.xml");
          XPathNavigator navigator = document.CreateNavigator();
          navigator.MoveToRoot();
          //XPathNodeIterator iterBooks = navigator.Select("Root/SparkasseNiederlausitz");
          navigator.MoveToChild("Sparkasse",String.Empty);
          navigator.DeleteSelf();
/*          foreach (XPathNavigator nodeBook in iterBooks)
          {
            if(nodeBook.GetAttribute("Titel",String.Empty).Equals(kontenliste.SelectedItem)){

            }
          }*/
        }
      }                    

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<?xml version="1.0" encoding="utf-8" ?>
<books>
  <book auhtor="Ernest Hemmingway">Fiesta</book>
  <book author="Unknown">The principles of software development</book>
</books>                    

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private static void NavigateBooks()
{
    XPathDocument docBooks = new XPathDocument("../../Books.xml");
    XPathNavigator navBooks = docBooks.CreateNavigator();
    XPathNodeIterator iterBooks = navBooks.Select("books/book");

    foreach (XPathNavigator nodeBook in iterBooks)
    {
        Console.WriteLine("Found book: {0}", nodeBook.Value);
        Console.WriteLine("Author: {0}", nodeBook.GetAttribute("author", String.Empty));
    }        
}                    

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var root = XElement.Load(...);
root.Elements("type").Single(child => (string)child.Attribute("Kreditinstitut") == "Sparkasse").Delete();                    

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            XElement xe1 = XElement.Load("konten.xml");
            xe1.Elements("SparkasseNiederlausitz").Single(child => (string)child.Attribute("Kreditinstitut") == "Sparkasse Niederlausitz").Remove();                    

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<Kreditinstitut Name="Sparkasse Niederlausitz" ... />