包含用户的姓名，电话号码，单位，地址，电子邮件。（2）用菜单选择并完成下述系统功能 #1各种基本数据的录入。如基本信息录入等。#2各种基本数据的修改。即允许对已经录入的数据重新进行编辑修改。#3各种基本数据的插入。如在信息中插入一条新信息等。#4各种基本数据的删除。如删除某个信息等。#5基于各种数据的查询。如按姓名查询或按电话号码查询。#6基于各种基本数据的统计计算。如统计各个地区的电话号码个数。#7按姓名进行排序。-1 can also improve data access, you can consider using IQueryable type of reuse　2 interface needs to be improved 3 Controller action needs to be improved, BL remove multiple records can not be grouped Factory instead of 4 5 6 data access exception handling issues. .. consider using a common excuse to isolate, IDataAccess, factory only call interfaces do not call data access classes to facilitate data access be extended to a variety of different storage methods 7. Import and Export