ASP.Net MVC Error Handling

global.asax

protected void Application_Error()
{
    var unhandledException = Server.GetLastError();
    var httpException = unhandledException as HttpException;
    if (httpException == null)
    {
        var innerException = unhandledException.InnerException;
        httpException = innerException as HttpException;
    }

    if (httpException == null) return;

    var httpCode = httpException.GetHttpCode();
    switch (httpCode)
    {
        case (int)HttpStatusCode.NotFound:
            Response.Redirect("/Error/NotFound");
            break;
        case (int)HttpStatusCode.BadRequest:
            Response.Redirect("/Error/BadRequest");
            break;
        case (int)HttpStatusCode.InternalServerError:
            Response.Redirect("/Error/InternalServerError");
            break;
    }
}