Version of ?#

Hello!

Please answer to me for two questions.

1. What is a version of ?# uses cAlgo? Is it support .NET 4.5 or .NET 4.0 only?
2. I try to use a lot of modules that I use in my programs on VS2012 but some modules (they are comment) gave error on compilation. What is a reason of it?

using System;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Requests;
using cAlgo.Indicators;

using System.Collections.Generic;
using System.ComponentModel;
//using System.Data; // get error
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//using System.Windows.Forms; // get error
using System.IO;