Drawing, and Appending to a Double-Horizontal Line

I know how to draw straight lines in C#, but I would like to draw a horizontal line, with two colors. Light blue on the top, and dark blue on the bottom.开发者_StackOverflow中文版 Also, how would I sort of... Append to that line? For example, every few seconds, that line will become bigger... like a ProgressBar. (btw, I'm not creating a ProgressBar, just using that as an example).

Here's the kind of line that I'd like to draw. I am aware that I can simply use PictureBox. But I want to start drawing!

Also, if there are other ways of drawing, than GDI or GDI+, could you list or link to those?

Thanks!

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You can implement the onPaint event on any Control and then do the drawing manually on the passed graphics object.