custom plugin assembly cannot be compiled

Question

I have a plugin written in C# for a web application. When it is called by the application, the plugin assembly cannot be compiled.

I have found the point of the problem, but IDNK how to solve it.

Code

using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.Web;
using System.Linq;

namespace App.plugins
{
    public class ThePlugin
    {
        public string ToHtml(){...}
    }
}

When I omit using System.Linq; the plugin is compiled successfully. I also checked the IIS for loaded assemblies and the System.Core (containing System.Linq) is in the list.

EDIT:

How:

 CompilerResults cr = provider.CompileAssemblyFromSource(cp, SourceCode);

Obtained: error, that tells me in the System namespace name does not exist type or namespace Linq (Error No# CS0234)

FrameWork: .NET FrameWork 4.5

Any hints?

Answer 1

It was necessary to add System.Core.dll to the list of DLLs as below

CompilerParameters cp = new CompilerParameters();
cp.ReferencedAssemblies.Add("System.Core.dll");
CompilerResults cr = provider.CompileAssemblyFromSource(cp, SourceCode);