An example C# program that uses OpenTK. Displays a colored triangle.

OpenTKExample.cs

// C# example program to demonstrate OpenTK
//
// Steps:
// 1. Create an empty C# console application project in Visual Studio
// 2. Place OpenTK.dll in the directory of the C# source file
// 3. Add System.Drawing and OpenTK as References to the project
// 4. Paste this source code into the C# source file
// 5. Run. You should see a colored triangle. Press ESC to quit.
//
// Copyright (c) 2013 Ashwin Nanjappa
// Released under the MIT License

using System;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Input;

namespace StarterKit
{
    class Game : GameWindow
    {
        public Game()
            : base(800, 600, GraphicsMode.Default, "OpenTK Quick Start Sample")
        {
            VSync = VSyncMode.On;
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            GL.ClearColor(0.1f, 0.2f, 0.5f, 0.0f);
            GL.Enable(EnableCap.DepthTest);
        }

        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);

            GL.Viewport(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height);

            Matrix4 projection = Matrix4.CreatePerspectiveFieldOfView((float)Math.PI / 4, Width / (float)Height, 1.0f, 64.0f);
            GL.MatrixMode(MatrixMode.Projection);
            GL.LoadMatrix(ref projection);
        }

        protected override void OnUpdateFrame(FrameEventArgs e)
        {
            base.OnUpdateFrame(e);

            if (Keyboard[Key.Escape])
                Exit();
        }

        protected override void OnRenderFrame(FrameEventArgs e)
        {
            base.OnRenderFrame(e);

            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

            Matrix4 modelview = Matrix4.LookAt(Vector3.Zero, Vector3.UnitZ, Vector3.UnitY);
            GL.MatrixMode(MatrixMode.Modelview);
            GL.LoadMatrix(ref modelview);

            GL.Begin(BeginMode.Triangles);

            GL.Color3(1.0f, 1.0f, 0.0f); GL.Vertex3(-1.0f, -1.0f, 4.0f);
            GL.Color3(1.0f, 0.0f, 0.0f); GL.Vertex3(1.0f, -1.0f, 4.0f);
            GL.Color3(0.2f, 0.9f, 1.0f); GL.Vertex3(0.0f, 1.0f, 4.0f);

            GL.End();

            SwapBuffers();
        }

        [STAThread]
        static void Main()
        {
            // The 'using' idiom guarantees proper resource cleanup.
            // We request 30 UpdateFrame events per second, and unlimited
            // RenderFrame events (as fast as the computer can handle).
            using (Game game = new Game())
            {
                game.Run(30.0);
            }
        }
    }
}

Kindly Re-do this work in Visual Studio 2022, I tried running it on VS22 and it is crashing.

// 2. Place OpenTK.dll in the directory of the C# source file
Instead add it as a reference (in Proyect References) do the same for System.Drawing

I have it running in vs2022.

Thanks a lot.