CAD to BMP

... 
 using CADImport;
 using CADImport.DWG;
 using CADImport.DXF;
 using CADImport.RasterImage;
 ...
 
         private void CAD_to_BMP_Click(object sender, EventArgs e)
         {
             if ((OpenFileDialog1.ShowDialog() != DialogResult.OK)) return;
             //CADImage.CreateImageByExtension detects format by the extension specified in the argument. 
             //The correct class for any supported format will be used automatically. We recommend to
             //create a new drawing object with CADImage.CreateImageByExtension if import from the existed
             //file/stream is required.
             CADImage vDrawing = CADImage.CreateImageByExtension(OpenFileDialog1.FileName);
             vDrawing.LoadFromFile(OpenFileDialog1.FileName);
             // The bitmap will have 1000 px width, height will be calulated automatically
             Bitmap vBitmap = new Bitmap(1000, (int)(1000 * vDrawing.AbsHeight / vDrawing.AbsWidth));
             Graphics vGr = Graphics.FromImage(vBitmap);
             RectangleF vRect = new RectangleF(0, 0, (float)1000, (float)(vBitmap.Width * vDrawing.AbsHeight / vDrawing.AbsWidth));
             vDrawing.Draw(vGr, vRect);
             vBitmap.Save(OpenFileDialog1.FileName + ".bmp", System.Drawing.Imaging.ImageFormat.Bmp);
         }