public structure Area
    int pX;
    int pY;
    int sX;
    int sY;
    bool xForward;
    bool yForward;
end structure

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
    if (MousePressed == true)
    {
        int TempLX = 0, TempRX = 0, TempLY = 0, TempRY = 0, Area Selection;
        if (e.X > Selection.pX)
        {
            if (Selection.xForward == true)
            {
                Selection.sX = e.X;
            }
            else
            {
                if (e.X < Selection.sX)
                {
                    Selection.pX = e.X;
                }
                else
                {
                    Selection.pX = Selection.sX;
                    Selection.sX = e.X;
                    Selection.xForward = true;
                }
            }
        }
        else
        {
            if (Selection.xForward == true)
            {
                Selection.sX = Selection.pX;
                Selection.pX = e.X;
                Selection.xForward = false;
            }
            else
            {
                if (Selection.pX <= Selection.sX)
                {
                    Selection.pX = e.X;
                }
                else
                {
                    Selection.sX = e.X;
                }
            }
        }
        if (e.Y > Selection.pY)
        {
            if (Selection.yForward == true)
            {
                Selection.sY = e.Y;
            }
            else
            {
                if (e.Y < Selection.sY)
                {
                    Selection.pY = e.Y;
                }
                else
                {
                    Selection.pY = Selection.sY;
                    Selection.sY = e.Y;
                    Selection.yForward = true;
                }
            }
        }
        else
        {
            if (Selection.yForward == true)
            {
                Selection.sY = Selection.pY;
                Selection.pY = e.Y;
                Selection.yForward = false;
            }
            else
            {
                if (Selection.pY <= Selection.sY)
                {
                    Selection.pY = e.Y;
                }
                else
                {
                    Selection.sY = e.Y;
                }
            }
        }
        pictureBox2.Size = new Size(Selection.sX, Selection.sY);
        pictureBox2.Location = new Point(Selection.pX, Selection.pY);
    }
}