Why Bitmap Image size of Web Application differs from that Window Form application?

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ASP.NET

Windows

C#3.5

Web app Code:

Bitmap bitmapResult = null;

bitmapResult.Save("D:\\abc.jpeg",ImageFormat.Jpeg);

Window app code:

bitmapResult.Save("D:\\pqr.jpeg",ImageFormat.Jpeg);

i have used same functions to save the same image with different name i.e abc and pqr but still both the images vary in their sizes...why??