How to convert .bmp,.png files to .jpeg files in mvc4

if (Request.Files.Count > 0)
            {
                HttpPostedFileBase file = Request.Files[0];
                if (file != null && file.ContentLength > 0)
                {
                    string path = Path.GetFileName(file.FileName) + ".jpeg";

                    string saveFilePath = Path.Combine(Server.MapPath("/Images/"), path);

                    // Resize Image
                    if ((file.ContentLength / 1024) > 4096)
                    {
                        var newSize = new Size(100, 100);

                        using (var originalImage = System.Drawing.Image.FromFile(file.FileName))
                        {
                            using (var newImage = new Bitmap(newSize.Width, newSize.Height))
                            {
                                using (var canvas = Graphics.FromImage(newImage))
                                {
                                    canvas.SmoothingMode = SmoothingMode.AntiAlias;
                                    canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
                                    canvas.PixelOffsetMode = PixelOffsetMode.HighQuality;
                                    canvas.DrawImage(originalImage, new System.Drawing.Rectangle(new Point(0, 0), newSize));
                                    newImage.Save(saveFilePath, originalImage.RawFormat);
                                }
                            }
                        }
                    }
                    else
                    {
                        file.SaveAs(saveFilePath);
                    }
                }
            }