Rotate and Save image in C#

using System;

using System.Drawing;

namespace rotate

{

    class Program

    {

        static void Main(string[] args)

        {

            if (args.Length >= 2)

            {

                string url = args[0];

                string rotateAmount = args[1];

                string path = "image1.jpg";

                //create an image object from the image in that path

                System.Drawing.Image img = System.Drawing.Image.FromFile(path);

                //Rotate the image in memory

                img.RotateFlip(RotateFlipType.Rotate90FlipNone);

                //Delete the file so the new image can be saved

                System.IO.File.Delete(path);

                //save the image out to the file

                img.Save(path);

                //release image file

                img.Dispose();

                // Wait for user to acknowledge the results.

                Console.WriteLine(url + " " + rotateAmount);

                Console.WriteLine("Press any key to quit!");

                Console.Read();

            }

        }

    }

}

Error 1 The type or namespace name 'Image' does not exist in the namespace 'System.Drawing' (are you missing an assembly reference?) c:\users\martyn ball\documents\visual studio 2012\Projects\ConsoleApplication1\ConsoleApplication1\Program.cs 18 32 ConsoleApplication1

Error 2 The type or namespace name 'Image' does not exist in the namespace 'System.Drawing' (are you missing an assembly reference?) c:\users\martyn ball\documents\visual studio 2012\Projects\ConsoleApplication1\ConsoleApplication1\Program.cs 18 59 ConsoleApplication1

Error 3 The name 'RotateFlipType' does not exist in the current context c:\users\martyn ball\documents\visual studio 2012\Projects\ConsoleApplication1\ConsoleApplication1\Program.cs 21 32 ConsoleApplication1