C#重新绘制按钮

 public  class ButtonX:Button
    {

            protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
            {

                base.OnPaint(e);
                System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
                path.AddEllipse(0, 0, this.Width, this.Height);
                this.Region = new Region(path);

            }

            protected override void OnMouseEnter(EventArgs e)
            {
                Graphics g = this.CreateGraphics();
                g.DrawEllipse(new Pen(Color.Blue), 0, 0, this.Width, this.Height);
                g.Dispose();
            }

        }

然后生成解决方案，生成之后，工具箱里会有如下图：

这个组件就是新的Button,你直接拖到窗体上就好了，
这个是简单的，效果不满意可以随便画