“System.Drawing.Graphics”未定义构造函数

[yuzhenjiang]

我需要花一条直线不知道为什么会提示这个错误，希望能够给些处理方法。
Graphics g = new Graphics();
Pen p = new Pen(Color.Blue, 10);
g.DrawLine(p, 10, 10, 100, 100);

[anzhiqiang_touzi]

        System.Drawing.Image image=new System.Drawing.Bitmap(100,100);
        Graphics g = Graphics.FromImage(image);
        Pen p = new Pen(Color.Blue, 10);
        g.DrawLine(p, 10, 10, 100, 100); 

说名：
首先：你要用画笔画图的话，你要有东西可画，也就是说你要画在什么地方上
System.Drawing.Image image=new System.Drawing.Bitmap(100,100);//产生一个空白的图片
Graphics g = Graphics.FromImage(image);//在此图片上绘制

Pen p = new Pen(Color.Blue, 10);//产生画笔
g.DrawLine(p, 10, 10, 100, 100); //在上面画图

[cppfaq]

Graphics g = CreateGraphics();

[gadev]

Graphics g = this.CreateGraphics();