说明：  利用ArcEngine+C#进行二次开发的常用功能代码实现，比如建立桌面GIS系统，鹰眼实现及符号库的设计与实现等等
(Common functions of secondary development ArcEngine+C# code to achieve, such as the establishment of a desktop GIS system, Hawkeye realized and the Design and Implementation of the symbol library)