如何打印一张位图图片

     public   partial   class  frmPrint : DevExpress.XtraEditors.XtraForm
    {
        Bitmap myPic;
         bool  landscape = false ;
         // 构造函数
         public  frmPrint( string  mypic)
        {
            InitializeComponent();
            myPic  =   new  Bitmap(mypic);
             this .pictureEdit1.Image  =  myPic;
        }
         // 打印时绘图
         private   void  printDocument1_PrintPage( object  sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            e.Graphics.DrawImage(myPic,  0 ,  0 );
        }
         // 关闭
         private   void  toolStripButton2_Click( object  sender, EventArgs e)
        {
             this .Close();
        }
         // 打印
         private   void  toolStripButton1_Click( object  sender, EventArgs e)
        {
            PrintDialog MyPrintDg  =   new  PrintDialog();
            MyPrintDg.Document  =  printDocument1;

             if (landscape)
                printDocument1.DefaultPageSettings.Landscape  =   true ;
             else
                printDocument1.DefaultPageSettings.Landscape  =   false ;

             if  (MyPrintDg.ShowDialog()  ==  DialogResult.OK)
            {
                 try
                {
                    printDocument1.Print();
                }
                 catch
                {    // 停止打印
                    printDocument1.PrintController.OnEndPrint(printDocument1,  new  System.Drawing.Printing.PrintEventArgs());
                }
            }
        }
         // 是否横板打印
         private   void  toolStripCheckBox1_CheckedChanged( object  sender, EventArgs e)
        {
            landscape  =   ! landscape;
        }
         // 窗体即将关闭
         private   void  frmPrint_FormClosing( object  sender, FormClosingEventArgs e)
        {
            pictureEdit1.Dispose();
            myPic.Dispose();
            Directory.SetCurrentDirectory(Application.StartupPath);
             if  (Directory.Exists(Application.StartupPath  +   " \\tmpbmp " ))
            {
                Directory.Delete(Application.StartupPath  +   " \\tmpbmp " ,  true );
            }
            e.Cancel  =   false ;
        }
    }