.NET (Core and Framework)

<br />
private StringCollection GetDomainList() <br />
{ <br />
  StringCollection domainList = new StringCollection(); <br />
  try <br />
  { <br />
    DirectoryEntry en = new DirectoryEntry("WinNT://"); <br />
    // Search for objectCategory type "Domain" <br />
    DirectorySearcher srch = new DirectorySearcher("objectCategory=Domain"); <br />
    SearchResultCollection coll = srch.FindAll(); <br />
    // Enumerate over each returned domain. <br />
    foreach (SearchResult rs in coll) <br />
    { <br />
      ResultPropertyCollection resultPropColl = rs.Properties; <br />
      foreach( object domainName in resultPropColl["name"]) <br />
      { <br />
        domainList.Add(domainName.ToString()); <br />
      } <br />
    } <br />
  } <br />
  catch (Exception ex) <br />
  { <br />
    Trace.Write(ex.Message); <br />
  } <br />
  return domainList; <br />
} <br />

dstImg = new Bitmap(srcImage);

protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);
    e.Graphics.DrawImage(dstImg, 0, 0);
    // An alternative that doesn't work any better
    //Rectangle r = new Rectangle(0, 0, srcImage.Width, srcImage.Height);
    //e.Graphics.DrawImage(dstImg, r, r, GraphicsUnit.Pixel);
    // Junxtapose original to the right of dstImg, it will have the correct size:
    e.Graphics.DrawImage(srcImage, dstImage.Width + 1, 0);
}

dstImg = new Bitmap(srcImage.Width, srcImage.Height, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(dstImg);
Rectangle r = new Rectangle(0, 0, srcImage.Width, srcImage.Height);
g.DrawImage(srcImage, r, r, GraphicsUnit.Pixel);
g.Dispose();