vs运行webAppliance项目时出现以下错误：

Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1617: Invalid option '6' for /langversion; must be ISO-1, ISO-2, 3, 4, 5 or Default

错误图片：

解决办法，打开web.config文件

注释掉<system.codedom></system.codedom>节点，它是在修改NET Framework的时候自动加的。

<system.codedom><compilers><compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701"><providerOption name="CompilerVersion" value="v4.0"/><providerOption name="WarnAsError" value="false"/></compiler><compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.VisualBasic.VBCodeProvider, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+"><providerOption name="CompilerVersion" value="v4.0"/><providerOption name="OptionInfer" value="true"/><providerOption name="WarnAsError" value="false"/></compiler></compilers></system.codedom>

图片示例：

再次运行，问题解决。

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Server Error in ‘/‘ Application.问题解决

Server Error in '/' Application.

Compilation Error

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