怎么监视鼠标的显示状态

如何监视鼠标的显示状态
我想用c#做个脚本 触发条件是：当鼠标指针由链接选择（小手）变为正常选择（指针）时

请教各位达人 如何获取？

[解决办法]

C# code

        Cursor old;        private void Form1_Load(object sender, EventArgs e)        {            this.Cursor = Cursors.Hand;            old = this.Cursor;        }        private void Form1_CursorChanged(object sender, EventArgs e)        {            if (old == Cursors.Hand && this.Cursor == Cursors.Default)                MessageBox.Show("ok");                    }        private void button1_Click(object sender, EventArgs e)        {            this.Cursor = Cursors.Default;            old = this.Cursor;        }