Scale Down Images in C#

1) open a file stream

        FileStream fs = File.OpenRead(fullImgPath);

2) load the image

        Image fullImg = Image.FromStream(fs);

3) define the new height

        int thHeight = Convert.ToInt32(ConfigurationManager.AppSettings["thumbHeight"]);

4) define a callback function when thumbnail abort

        Image.GetThumbnailImageAbort dummyCallback=new Image.GetThumbnailImageAbort(ThumbnailCallback);

5) set the new height and width of the image using GetThumbnailImage function

        Image thumbImg = fullImg.GetThumbnailImage((int)(fullImg.Width * thHeight) / fullImg.Height, thHeight, dummyCallback, IntPtr.Zero);

6) save the thumb image

        thumbImg.Save(thumbImgpath);

7) dispose

        thumbImg.Dispose();

8) the call back function implementation

public static bool ThumbnailCallback() { return false; }