出现问题提示：
System.Configuration.ConfigurationErrorsException: The connection name 'LocalSqlServer' was not found in the applications configuration or the connection string is empty. (C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Config\machine.config line 121)
解决方案：
1.添加如下代码到web.config
<connectionStrings>
<remove name="LocalSqlServer" />
<add name="LocalSqlServer" connectionString="server=.;uid=user;pwd=pwd;Trusted_Connection=yes;database=Enterprise" />
</connectionStrings>
2.根本解决办法,把原来的.net 框架卸载了,重新安装一次。搞定！
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