I'm making a Tetris Clone in C# with XNA, and I'm unsure of how to actually implement the blocks.

I don't think that making the shapes as images will work (because parts are removed when lines are formed), so I Have blocks to make up the pieces like This.

Unfortunately, I don't know how to actually define the blocks to make the pieces, nor do I know how to manipulate them to make them rotate, etc.

Edit: I would also need assistance in learning how to make the Tetris Grid too.