This code start from examples that you can find here:
by "pRtkL xLr8r" and "i made this".

It show a textured cube rendered with BasicEffect (on left, with light) and
with Effect shader (on right, not light).
Not all faces are right textured.

Press keys:
Insert-Enter to toggle Full Screen/window mode;
arrows, PagUp, PagDown, Home, Fine to move;
Esc to exit.

To dowload the project:

I hope it can help.