Do you have an Image object or an image in a file.
If you have a file it's pretty easy:
int kilobytes = (new FileInfo( @"c:\image.jpg" )).Length / 1024;
If you have an image object it's harder to figure out as you'll need to
"save it" before you can know what size it is.
MemoryStream ms = new MemoryStream();
image.Save(ms, ImageFormat.Png); // change this to what format you need
int kilobytes = ms.Length / 1024;
ms.Close();
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