QuickFont -- Problem with resizing the window

class TextPrinter : GameWindow
    {
        QFont BasicFont;
 
        public TextPrinter()
            : base()
        {
            Load += new EventHandler<EventArgs>(TextPrinter_Load);
            RenderFrame += new EventHandler<FrameEventArgs>(TextPrinter_RenderFrame);
            Resize += new EventHandler<EventArgs>(TextPrinter_Resize);
            UpdateFrame += new EventHandler<FrameEventArgs>(TextPrinter_UpdateFrame);
            Mouse.WheelChanged += new EventHandler<MouseWheelEventArgs>(Mouse_WheelChanged);
            Keyboard.KeyDown += new EventHandler<KeyboardKeyEventArgs>(Keyboard_KeyDown);
        }
 
        private void SetupViewport()
        {
            GL.MatrixMode(MatrixMode.Projection);
            GL.LoadIdentity();
            GL.Ortho(0, Width, 0, Height, -1, 1);
            GL.Viewport(0, 0, Width, Height);
            GL.Disable(EnableCap.DepthTest);
        }
 
        private void TextPrinter_Load(object sender, EventArgs e)
        {
 
            // Setup the QFont
            var builderconf = new QFontBuilderConfiguration();
            builderconf.TextGenerationRenderHint = TextGenerationRenderHint.ClearTypeGridFit;
            BasicFont = new QFont(new Font("Calibri", 20f, FontStyle.Bold), builderconf);
            BasicFont.Options.Colour = new Color4(0f, 0f, 0f, 1f);
 
            SetupViewport();
 
 
        }
 
        private void TextPrinter_Resize(object sender, EventArgs e)
        {
            SetupViewport();
        }
 
 
 
        private void TextPrinter_UpdateFrame(object sender, EventArgs e)
        {
            //var mouse = 
        }
 
        // For adjusting the window width on the fly
        private void Mouse_WheelChanged(object sender, MouseWheelEventArgs e)
        {
            this.Width += e.Delta;
        }
 
        // For adjusting the window width on the fly
        private void Keyboard_KeyDown(object sender, KeyboardKeyEventArgs e)
        {
            if (e.Key == Key.Left)
            {
                this.Width -= 1;
            }
            else if (e.Key == Key.Right)
            {
                this.Width += 1;
            }
        }
 
        private void TextPrinter_RenderFrame(object sender, EventArgs e)
        {
            GL.ClearColor(Color.LightGray);
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
 
 
            GL.MatrixMode(MatrixMode.Modelview);
            GL.LoadIdentity();
 
 
 
            GL.Color3(Color.Black);
            GL.Begin(BeginMode.Lines);
            GL.Vertex2(Width / 2.0, 0);
            GL.Vertex2(Width / 2.0, Height);
            GL.End();
 
            GL.Begin(BeginMode.Lines);
            GL.Vertex2(Width / 3.0, 0);
            GL.Vertex2(Width / 3.0, Height);
            GL.End();
 
            GL.Begin(BeginMode.Lines);
            GL.Vertex2(2f * (Width / 3.0), 0);
            GL.Vertex2(2f * (Width / 3.0), Height);
            GL.End();
 
            QFont.Begin();
            BasicFont.Print("O", QFontAlignment.Centre, new Vector2(Width / 2f, Height / 2f));
            QFont.End();
            GL.Disable(EnableCap.Texture2D);
 
            QFont.Begin();
            BasicFont.Print("O", QFontAlignment.Centre, new Vector2(Width / 3f, Height / 2f));
            QFont.End();
            GL.Disable(EnableCap.Texture2D);
 
            QFont.Begin();
            BasicFont.Print("O", QFontAlignment.Centre, new Vector2(2f *  (Width / 3f), Height / 2f));
            QFont.End();
            GL.Disable(EnableCap.Texture2D);
 
 
            SwapBuffers();
        }
 
 
        static void Main(string[] args)
        {
            using (TextPrinter win = new TextPrinter())
            {
                win.Run(100.0);
            }
        }
    }