public static SaveObject Deserialize(String streamUrl)
 {
     FileStream stream = null;
     SaveObject dataO = null;
     try
     {
         if (File.Exists(streamUrl))
         {
             stream = File.Open(streamUrl, FileMode.Open);
             BinaryFormatter serializer = new BinaryFormatter();
             object o = serializer.Deserialize(stream);
             if(o.GetType() == typeof(SaveObject))
             {
                 dataO = (SaveObject)o;
             }
             else if (o.GetType() == typeof(DataTable))
             {
                 DataTable dt = (DataTable)o;
                 dataO = new SaveObject(dt, 100);
             }
             else
             {
                 MessageBox.Show("Nicht kompatible Datei");
                 DataTable edt = new DataTable();
                 edt.Columns.Add("Name");
                 edt.Columns.Add("URL");
                 edt.Rows.Add();
                 dataO = new SaveObject(edt, 100);
             }
         }
         else
         {
             DataTable edt = new DataTable();
             edt.Columns.Add("Name");
             edt.Columns.Add("URL");
             edt.Rows.Add();
             dataO = new SaveObject(edt, 100);
             
         }
     }
     catch (Exception e)
     {
         MessageBox.Show(e.Message);
     }
     finally
     {
         if (stream != null && stream.CanRead)
         {
             stream.Close();
         }
     }
     return dataO;
 } 
        public static void Serialize(DataTable dt, int vol, String streamUrl)
        {
            SaveObject so = new SaveObject(dt, vol);
            try
            {
                if (File.Exists(streamUrl))
                {
                    File.Delete(streamUrl);
                }
                FileStream fs = File.Create(streamUrl);
                BinaryFormatter serializer = new BinaryFormatter();
                serializer.Serialize(fs, so);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }

        }