private void button1_Click(object sender, EventArgs e)
        {
            Bitmap b1 = new Bitmap(Convert.ToInt32(textBox2.Text), Convert.ToInt32 ( textBox3.Text));
            Graphics g1 = Graphics.FromImage(b1);
            Font font1 = new Font("C39HrP24DlTt", Convert.ToInt32(textBox4.Text));
            g1.DrawString(textBox1.Text.ToString(), font1, Brushes.Black, new PointF(Convert.ToInt32(textBox5.Text), Convert.ToInt32(textBox6.Text)));
            pictureBox1.BackgroundImage = b1;
            pictureBox1.BackgroundImageLayout = ImageLayout.Zoom;
        }

        private void button2_Click(object sender, EventArgs e)
        {
this.pageSetupDialog1.ShowDialog(); 

        }

        private void button3_Click(object sender, EventArgs e)
        {
this.printPreviewDialog1.ShowDialog(); 

        }

        private void button4_Click(object sender, EventArgs e)
        {
if (this.printDialog1.ShowDialog() == DialogResult.OK)
            {
this.printDocument1.Print();
            }
        }

        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
//打印内容 为 整个Form
//Image myFormImage;
//myFormImage = new Bitmap(this.Width, this.Height);
//Graphics g = Graphics.FromImage(myFormImage);
//g.CopyFromScreen(this.Location.X, this.Location.Y, 0, 0, this.Size);
//e.Graphics.DrawImage(myFormImage, 0, 0);

//打印内容 为 局部的 this.groupBox1
            Bitmap _NewBitmap = new Bitmap(groupBox1.Width, groupBox1.Height);
            groupBox1.DrawToBitmap(_NewBitmap, new Rectangle(0, 0, _NewBitmap.Width, _NewBitmap.Height));
            e.Graphics.DrawImage(_NewBitmap, 0, 0, _NewBitmap.Width, _NewBitmap.Height); 

//打印内容 为 自定义文本内容 
            /*Font font = new Font("宋体", 12);
            Brush bru = Brushes.Blue; 
            for (int i = 1; i <= 5; i++)
            {
                e.Graphics.DrawString("Hello world ", font, bru, i*20, i*20);
            }*/
        }

        public Form1()
        {
            InitializeComponent();
this.printDocument1.OriginAtMargins = true;//启用页边距
              this.pageSetupDialog1.EnableMetric = true; //以毫米为单位
         }