Adding System.drawing reference

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C#

C#4.0

Hi,
I want to draw the graphs in c# windows application without using 'chart' control. For that I added a reference (system.drawing) from add reference. After that I wrote the following code

private void button1_Click(object sender, EventArgs e)
    {
        Pen pen = new Pen(Color.FromArgb(255, 0, 0, 0));

           e.Drawing2D.DrawLine(pen, 20, 10, 300, 100);
    }

But I am getting an error that :Error 1 The type or namespace name 'graphics' does not exist in the namespace 'System.Drawing' (are you missing an assembly reference?)