silverlight 写的手写板，点击保存按照手写内容生成png到服务器然后返回此png图片。整个过程为无刷新操作-silverlight written tablet, click Save in accordance with the the handwritten content generated png This png image to the server and then return. The whole process for no refresh operation

编写一个单文档应用程序，添加【图像显示】菜单，点击以后在视图区能显示一幅8位灰度图，并在【查看】菜单里添加【显示直方图】一项子菜单，消息相应后弹出对话框显示右边灰度图相应的直方图。-Write a single document application, add [Image Display] menu, click on later in the view area to show an 8 grayscale, and in the [View] menu to display the hi