File Not Found ,Could not load or find Assembly System.Net 2.0.5.0

I have made the MVC4 application.

In the application , I am getting the data from GoogleAPI so I am using DotNetOpenAuth for Authentication and I have added the System.Net 2.1.10.0 assembly.

Its working fine when we deployed into IIS 7, but when I deployed to IIS 6 it gives error but I don't have Mapping errors.

Application is running and I am getting error of Assembly reference .

Error Msg - Could not load or Find assembly System.Net 2.0.5.0 , The given assembly reference  is invalid . 

Stack Trace - [FileLoadException]: Could not load file or assembly 'System.Net, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, Retargetable=Yes' or one of its dependencies. The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047) at SkyoApp.SkyoApp.DashBoardController.GetChartData(DateTime Fromdate, DateTime Todate, String BusinessPartner, String Type) in D:\Santosh\Projects\SkyoApp from Repository\SkyoApp\SkyoApp\Controllers\DashBoardController.vb:line 256 at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary2 parameters) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_DisplayClass42.b_41() at System.Web.Mvc.Async.AsyncResultWrapper.<>c_DisplayClass81.<BeginSynchronous>b__7(IAsyncResult _) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.End() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_DisplayClass37.<>c_DisplayClass39.b_33() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_DisplayClass4f.b_49() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_DisplayClass37.b_36(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.End() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<>c__DisplayClass2a.<BeginInvokeAction>b__20() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.End() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) at System.Web.Mvc.Controller.<>c_DisplayClass1d.b_18(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.<>c_DisplayClass4.b_3(IAsyncResult ar) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.End() at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.End() at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.<>c_DisplayClass8.b_3(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.<>c_DisplayClass4.b_3(IAsyncResult ar) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End() at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Nope. This is not a duplicate question.

The answer may be found here: http://code.google.com/p/google-api-dotnet-client/issues/detail?id=378#makechanges