using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace Facultate
{
    public partial class DesenImagine : Form
    {
        private Graphics g;
        private Bitmap externalFile;

        private Pen p;
        public Point oldPoint = new Point(0, 0);

        public DesenImagine()
        {
            p = new Pen(Color.Black);

            InitializeComponent();

            this.Paint += new PaintEventHandler(DesenImagine_Paint);
        }

        void DesenImagine_Paint(object sender, PaintEventArgs e)
        {
	       ...
                g = e.Graphics;
	       ...
        }

        void DesenImagine_MouseMove(object sender, MouseEventArgs e)
        {
           Point pt1 = new Point(30, 30);
           Point pt2 = new Point(110, 100);
           g.DrawLine(p, pt1, pt2);
        }
    }
}