public void ScanDirectory(string pathname, bool rescan)
{
ImageResponseClient.PrepareResponse();
_pathname = pathname;
_rescan = rescan;
Dicom.Media.DicomFileScanner dfs = new Dicom.Media.DicomFileScanner();
dfs.FileFound += dfs_FileFound;
dfs.Progress += dfs_Progress;
dfs.Complete += dfs_Complete;
dfs.Start(pathname);
}