Describes the cause and action for error messages.
Error Message(English)：
if statement incorrect
Windows Phone 7 Mobile Applications Using Decision Structures - PDF
http://docplayer.net/19189399-Windows-phone-7-mobile-applications-using-decision-structures.html
An Drew Macro | Spreadsheet | Software Engineering - Scribd
https://www.scribd.com/document/46639262/An-Drew-Macro