C# .jpg help pls

Can i get some help?
I am making a program in c# that hides strings into images by changing each pixel color to be odd or even so i can store binary data in the pixels without changing the over all look of the image. Its just something i am making for fun but it only seems to work with .bmp's. I want to get it working with .jpg but i dont know how to do this. Right now i am just using System.Drawing.Bitmap to modify the images. Is their any other way that i can do this so it will be compatible with .jpg?

>>24
The JPEG specification specifies both lossy and lossless methods of compression.
That's the second time I've heard someone say that. Even if it were true (and it very obviously isn't), no software supports lossless JPEG.