Global_Application_Error.cs

protected  void Application_Error(object sender, EventArgs e)
{
    Exception lastError = Server.GetLastError();
    Server.ClearError();

    int statusCode = 0;

    if (lastError.GetType() == typeof(HttpException))
    {
        statusCode = ((HttpException) lastError).GetHttpCode();
    }
    else
    {
        // Not an HTTP related error so this is a problem in our code, set status to
        // 500 (internal server error)
        statusCode = 500;
    }

    HttpContextWrapper contextWrapper = new HttpContextWrapper(this.Context);

    RouteData routeData = new RouteData();
    routeData.Values.Add("controller", "Error");
    routeData.Values.Add("action", "Index");
    routeData.Values.Add("statusCode", statusCode);
    routeData.Values.Add("exception", lastError);
    routeData.Values.Add("isAjaxRequet", contextWrapper.Request.IsAjaxRequest());
           
    IController controller = new ErrorController();

    RequestContext requestContext = new RequestContext(contextWrapper, routeData);

    controller.Execute(requestContext);
    Response.End();
}