I encounter with below mentioed errors when I am trying to write TTD for ‘ViewBag’ property in MVC3
//Error1Predefined type ‘Microsoft.CSharp.RuntimeBinder.Binder’ is not defined or importedTestProject1
//Error2One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll?D:\MYPractice\MVC\RazorApplication\MVCDemo\TestProject1\UnitTest1.cs3113TestProject1
Controller :
public ActionResult Index()
{
ViewBag.Message = “Welcome to MVC3 demo”;
return View(“Index”);
}
MS Test :
public void TestMessage()
{
HomeController controler = new HomeController();
ViewResult res = controler.Index() as ViewResult;
Assert.AreEqual(“Welcome to MVC3 demo”, res.ViewBag.Message);
}
Solution :
1 . Right Click on MsTest project and select ‘Add reference’
2. Select ‘.Net’ tab in Add reference window.
3. Add select ‘Microsoft.CSharp.dll’ and click on add.
Now try to run test again.
Step By Step .NET 
This happened to me but have no idea why or how the reference got deleted…
On second thoughts, I’ve found out how. On VS2012 when looking as assemblies in the Reference Manager, it ticks all the assemblies you’ve referenced in your project. From my view, it looked like I had accidentally ticked the Microsoft.CSharp assembly, so I unticked it, and thus I unreferenced this. I’m more used to the VS2010 reference manager…
Change the target framework version to .Net Framework 4.0.
then your problem will be resolved
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Solution is to add references to the compiler:
var ass = csprovider.CompileAssemblyFromSource(
new CompilerParameters {
GenerateInMemory = true,
CompilerOptions = “/r:\”” + SysRefl.Assembly.GetAssembly(typeof(Microsoft.CSharp.RuntimeBinder.Binder)).Location + “\” “+
“/r:\”” + SysRefl.Assembly.GetAssembly(typeof(System.Runtime.CompilerServices.CallSite)).Location + “\” ”
},
“yourcodehere”
);
Thank you!