Form Is Flickering While I Redrawing And Drawing Shapes Winforms

i trying in winforms to draw an ellipse with mouse event ,
when mouse is down ,move and up my code goes like this :

   void panel1_MouseDown(object sender, MouseEventArgs e)
{
    startpoint.X = e.X;
    startpoint.Y = e.Y;

    if (m_drawrectiangle == true)
    {
        m_shape = new Rectiangle(0, 0, this);
        m_shape.Xpos = e.X;
        m_shape.Ypos = e.Y;
        draw = true;
    }
        if (m_draweliipse == true)
        {
            m_shape = new Circle(0, 0, this);
            m_shape.Xpos = e.X;
            m_shape.Ypos = e.Y;
            draw = true;

        }

}
void panel1_MouseUp(object sender, MouseEventArgs e)
{

    if (m_shape != null)
    {
        if(m_shape.Area()==0)
        {
            this.Cursor = Cursors.Default;
            draw = false;
        }
        if (draw == true)
        {
            shapes.Add(m_shape);
            this.Cursor = Cursors.Default;
            draw = false;
            Invalidate();
        }
    }
}
void panel1_MouseMove(object sender, MouseEventArgs e)
{

    this.Text = "(" + e.X + ", " + e.Y + ")";

    if (draw==true  && m_drawrectiangle==true )
    {
        int x = (e.X < 0) ? 0 : e.X;
        int y = (e.Y < 0) ? 0 : e.Y;

        //switch places
        m_shape.Xpos = (x < startpoint.X) ? x : startpoint.X;
        m_shape.Ypos = (y < startpoint.Y) ? y : startpoint.Y;

       ( (Rectiangle)m_shape).Width = Math.Abs(x - startpoint.X);
      ( (Rectiangle) m_shape).Height = Math.Abs(y - startpoint.Y);


        Invalidate(); //re-paint
    }
    if ( draw==true && m_draweliipse==true )
    {
        int x = (e.X < 0) ? 0 : e.X;
        int y = (e.Y < 0) ? 0 : e.Y;

        //switch places
        m_shape.Xpos = (x < startpoint.X) ? x : startpoint.X;
        m_shape.Ypos = (y < startpoint.Y) ? y : startpoint.Y;
    double deltax=Math.Pow(x-startpoint.X,2);
    double deltay=Math.Pow(y-startpoint.Y,2);
    ((Circle)m_shape).Diam =(decimal)Math.Sqrt(deltax +deltay);//typecast safe
        Invalidate(); //re-paint

    }
}

protected override void OnPaint(PaintEventArgs e)
{

    if(draw==true)
    {
        m_shape.draw();
    }
    if (shapes.Count > 0)
    {
        foreach (shape a in shapes)
        {
            a.draw();
            if (m_drawarea == true)
            {
                string text1 = a.Area().ToString("0. 00");
                Font font1 = new Font("Arial", 8, FontStyle.Bold, GraphicsUnit.Point);
                using (Graphics rectangledraw = CreateGraphics())
                {
                    rectangledraw.DrawString(text1, font1, Brushes.Blue, (float)a.Xpos, (float)a.Ypos);

                }
            }

        }
    }

   public override void draw()
        {
            using (Graphics rectangledraw = m_canavs.CreateGraphics())
            {
                RectangleF rectF1 = new RectangleF(Xpos, Ypos ,(float)m_diam, (float)m_diam);
                rectangledraw.DrawEllipse(new Pen(Color.Black,2),Rectangle.Round(rectF1));
            }
        }
    }
}