private MemoryStream CreateNewFile(DataItem file)
 {
     MemoryStream stream = new MemoryStream();
     StreamWriter writer = new StreamWriter(stream, new UTF8Encoding());
     writer.Write(file.FileName);
     writer.Flush();
     stream.Seek(0, SeekOrigin.Begin);
     return stream;
 }
 private bool CheckIsFileSelected(DataItem file)
 {
     return file.IsSelected;
 }