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Код

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

namespace Рисовалко
{
    public partial class Окно : Form
    {
        private DrawingShape currentShape;
        private BufferedGraphicsContext bgContext;
        private BufferedGraphics gBuffer;
        private BufferedGraphics tgBuffer;
        private Point sp, ep,op;
        private bool draw = false;
        private bool drawl = false;

        public Окно()
        {
            InitializeComponent();
            bgContext = BufferedGraphicsManager.Current;
            bgContext.MaximumBuffer = new Size(pnlDrawPanel.Width+1,pnlDrawPanel.Height+1);
            gBuffer = bgContext.Allocate(pnlDrawPanel.CreateGraphics(),
                                         new Rectangle(0, 0, pnlDrawPanel.Width, pnlDrawPanel.Height));
            tgBuffer = bgContext.Allocate(pnlDrawPanel.CreateGraphics(),
                                         new Rectangle(0, 0, pnlDrawPanel.Width, pnlDrawPanel.Height));
            SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
            DoubleBuffered = true;
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
        }


        private void tspImage_Click(object sender, EventArgs e)
        {
        }

        private void pnlDrawPanel_Paint(object sender, PaintEventArgs e)
        {
            gBuffer.Render(e.Graphics);
        }

        private void toolStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {

        }

        private void tspImage_MouseUp(object sender, MouseEventArgs e)
        {
            draw = true;
           
        }

        private void pnlDrawPanel_MouseUp(object sender, MouseEventArgs e)
        {
            if (draw && !drawl)
            {
                currentShape = new Line();
                sp = e.Location;
                ep = sp;
                drawl = true;
                return;
            }
            if (drawl)
            {
                tgBuffer = bgContext.Allocate(gBuffer.Graphics,
                                            new Rectangle(0, 0, pnlDrawPanel.Width, pnlDrawPanel.Height));
                drawl = false;
            }
        }

        private void pnlDrawPanel_MouseMove(object sender, MouseEventArgs e)
        {
            if(drawl)
            {
                gBuffer = bgContext.Allocate(tgBuffer.Graphics,
                                             new Rectangle(0, 0, pnlDrawPanel.Width, pnlDrawPanel.Height));
                // Create a pen that has the same background color as the form
                ep = e.Location;
                // Create a pen that will draw the blue line
                Pen linePen = new Pen(Color.Blue);
                // Store the X coordinate
                gBuffer.Graphics.DrawLine(linePen, sp, ep); 
                tgBuffer = bgContext.Allocate(gBuffer.Graphics,
                                             new Rectangle(0, 0, pnlDrawPanel.Width, pnlDrawPanel.Height));
                pnlDrawPanel.Refresh();

            }
        }
    }
}