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当我开启惰性加载情况下，系统会报此异常信息，出现此异常是发生于Sql server 2005.
解决方法：在数据库连接字符串中添加MARS信息为true
<add name="CRGDatabase" connectionString="Data Source=./;Initial Catalog=DB;uid=User;pwd=Pwd;MultipleActiveResultSets=true;" providerName="System.Data.SqlClient"/>
There is already an open DataReader associated with this Command which must be closed first.
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原文地址：http://www.cnblogs.com/gary-shao/p/5369955.html
