Passwort generieren

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private string PW(int Länge)
{  
  string ret = string.Empty;
  System.Text.StringBuilder SB = new System.Text.StringBuilder();
  string Content = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvw!öäüÖÄÜß\"§$%&/()=?*#-";
  Random rnd = new Random();      
  for( int i = 0; i < Länge; i++)
    SB.Append(Content[rnd.Next(Content.Length)]);
  return SB.ToString();
}