Highlight and crop an image in C#

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//We assume that GdPicture has been correctly installed and unlocked.
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//We assume the GdViewer object called GdViewer1 has been created and painted on the form.
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GdPictureImaging oGdPictureImaging = new GdPictureImaging();
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//Loading the image from a file.
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int currentImageID = oGdPictureImaging.CreateGdPictureImageFromFile("C:\\Image.tif");
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//Checking if the image resource has been loaded correctly.
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if (oGdPictureImaging.GetStat() != GdPictureStatus.OK)
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{
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   MessageBox.Show("The image can't be loaded. Error: " + oGdPictureImaging.GetStat().ToString(), "Drawing regions Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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}
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else
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{
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   //Displaying the image in the GdViewer.
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   GdViewer1.DisplayFromGdPictureImage(currentImageID);
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}
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//We will keep the current image for further use, see below.
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int selectedImageID = 0; //A new image we are going to create.
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             //On the Mouse UP event on the GdViewer, get a highlighted region coordinates based on the rectangle of selection of the GdViewer.
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             //If no rectangle of selection is painted on the GdViewer, this event will do nothing.
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public void Mouse_UP_Draw_Region(System.Object eventSender, System.EventArgs eventArgs)
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{
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   //Initializing variables to hold the position of the rectangle of selection on the document.
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   int leftArea = 0;
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   int topArea = 0;
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   int widthArea = 0;
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   int heightArea = 0;
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   //Checking if a rectangle of selection has been painted on the GdViewer.
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   if (GdViewer1.IsRect())
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   {
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    //Getting the location of the selection on the document.
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    GdViewer1.GetRectCoordinatesOnDocument(ref leftArea, ref topArea, ref widthArea, ref heightArea);
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    //Creating the image from the highlighted region.
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    selectedImageID = oGdPictureImaging.CreateClonedGdPictureImageArea(currentImageID, leftArea, topArea, widthArea, heightArea);
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    GdViewer1.DisplayFromGdPictureImage(selectedImageID);
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   }
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}
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// Do not forget to release and dispose both images!
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oGdPictureImaging.ReleaseGdPictureImage(currentImageID);
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oGdPictureImaging.ReleaseGdPictureImage(selectedImageID);
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oGdPictureImaging.Dispose();