Graphics graphics = e.Graphics;

             //绘制实线

             using (Pen pen = new Pen(Color.Black, ))

             {

                 pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid; //实线

                 graphics.DrawLine(pen,,,,);

             }

             //画出虚线

             using (Pen pen = new Pen(Color.Black, ))

             {

                 pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash; //虚线

                 graphics.DrawLine(pen, , , , );

             }

             //画出矩形

             using (Pen pen = new Pen(Color.Black, ))

             {

                  Rectangle rectangle = new Rectangle(,,,);

                     graphics.DrawRectangle(pen,rectangle);

             }

             //绘制字符串

             string str = "Hello 笨男孩!";

             graphics.DrawString(str, this.Font, Brushes.Black, , );

             //测量字符串的高度和宽度

             SizeF szfTitle = graphics.MeasureString(str, this.Font);

             graphics.DrawString(str, this.Font, Brushes.Black, , -(int)szfTitle.Height);

             graphics.DrawString("该字符串高度："+szfTitle.Height+" 字符串宽度："+szfTitle.Width, this.Font, Brushes.Black, , );

             //绘制圆

             using(Pen pen = new Pen(Color.Black,))

             {

                 //圆

                 graphics.DrawEllipse(pen,,,,); //在画板上画椭圆,起始坐标为(10,10),外接矩形的宽为100,高为100   此时就是一个圆

                 //椭圆

                 graphics.DrawEllipse(pen, , , , ); //在画板上画椭圆,起始坐标为(10,10),外接矩形的宽为100,高为50   此时就是一个椭圆

             }