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?

>>37
Seriously, they don't think that the FBI or NSA or CIA have any way to detect that an image has been edited?
I find it scary to think that the NSA have so much information about information in general that they could actually do this.
(Like what an alleged NSA employee said, that there's a way of distinguishing encrypted and random data)

But then the article says stuff like
But back then, it was only a theory.