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Asked: 2026-05-10T23:11:50+00:00

I’m trying to compile a POCO with this code public class MenuItem { public

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I’m trying to compile a POCO with this code 

public class MenuItem {     public string Name      { get; set; }     public string Url     { get; set; } }

I keep getting compile errors on the gets and sets with messages like: ‘MenuItem.Name.get’ must declare a body because it is not marked abstract or extern. What am I missing? I’m compiling this class in the App_Code folder of a local filesystem web site that is set to compile as .NET 3.5. I know I have done this before, but can’t figure out what I am doing differently.

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1 Answer

  1. Make sure your Web.config file contains a <system.codedom> subelement under <configuration> element like this:

    <system.codedom>   <compilers>     <compiler language='c#;cs;csharp' extension='.cs' warningLevel='4'               type='Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'>       <providerOption name='CompilerVersion' value='v3.5'/>       <providerOption name='WarnAsError' value='false'/>     </compiler>   </compilers> </system.codedom>

    The problem arises from the fact that ASP.NET is running the old version of C# compiler to compile your application (v2.0) which does not support automatic properties. In order to use .NET 3.5 features, you have to specify the compiler version in your Web.config explicitly.

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