GlControl Not Working

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Graphics.OpenGL.Enums;
 
namespace FormPractise
{
    public partial class frmMain : Form
    {
        bool glLoaded = false;
 
        public frmMain()
        {
            InitializeComponent();
        }
 
        private void glControl_Load(object sender, EventArgs e)
        {
            glLoaded = true;
            GL.ClearColor(Color.SkyBlue);
            glControl_Resize(null, EventArgs.Empty);
        }
 
        private void glControl_Paint(object sender, PaintEventArgs e)
        {
            if (!glLoaded) return;
 
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
            glControl.SwapBuffers();
        }
 
        public static Rectangle viewPort
        {
            get
            {
                int[] tab = new int[4];
 
                GL.GetInteger(GetPName.Viewport, tab);
 
                return new Rectangle(tab[0], tab[1], tab[2], tab[3]);
            }
            set
            {
                if (value.Size.IsEmpty)
                    return;
 
                Rectangle rect = value;
                if (rect.Width == 0)
                    rect.Width = 1;
 
                GL.Viewport(0, 0, rect.Width, rect.Height);
                GL.MatrixMode(MatrixMode.Projection);
                GL.LoadIdentity();
                GL.Ortho(rect.Left, rect.Width, rect.Height, rect.Top, -1, 1);
                GL.MatrixMode(MatrixMode.Modelview);
                GL.LoadIdentity();
            }
        }
 
        private void glControl_Resize(object sender, EventArgs e)
        {
            glControl.MakeCurrent();
            frmMain.viewPort = new Rectangle(new Point(), glControl.Size);
        }
    }
}