Introduction - If you have any usage issues, please Google them yourself
This sample demonstrates how to respond to the app s window
// getting resized by resizing the front and back buffers of
// the Direct3D device to match it. If you don t do this,
// Direct3D will be forced to perform a stretch blit when the
// window is enlarged and everything rendered will appear
// course and blocky. For example, if the initial window size
// and Direct3D device are set to 640x480 and you enlarge the
// window to be 1024x768, the Direct3D device will continue to
// render at 640x480 unless its front and back buffers are
// resized accordingly.