Like in minecraft you place two rows of blocks on top of each other :P
They can date as long as they are not related by blood.
Step 1 Lay the soaked bark white side up on the ground and temporarily weigh the corners with rocks to hold it in place while you carefully center the pre-built frame on top of the birch bark. Pile...
get one off google images.
You can learn all about it at the Microsoft portal site for the Silverlight development communityyou can choose this link for better...