(The difference between the two terms is not significant. The vertical direction is the straight direction of the equipment, and the horizontal direction is the horizontal direction. Both directions are supported in WindowsPhone7, but with tacit permission, Silverlight programs start vertically and XNA programs start horizontally (games usually play better on a wide screen). In this article, we only comment on the Silverlight program and how to do it after the direction is changed. The following attachments are included in this document when users use the program:)