How to draw a cube with different face colors using open tk and C#

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C#7.2

I am trying to draw a simple 3D object on a window using C# and Open TK. I have defined the GameWindowSettings and the NativeWindowSettings and passed them to the constructor of the GameWindow constructor. I have attached event handlers for the OnLoad and OnRenderFrame events of the game window and pasted code inside both of them that should draw a simple 3D cube on the window but its not working, can anyone help me make my code draw the desired object in the game window.

What I have tried:

namespace MyVideoGame
{
	internal static class Program
	{
		[STAThread]
		static void Main(string[] args) {
			//create a new window game settings
			var windowsettigs = new GameWindowSettings
			{
				//set the size of the game screen
				RenderFrequency = 60,
				UpdateFrequency = 60
			};
			//define the native window settings
			var nativeSettings = new NativeWindowSettings
			{
				Size = new Vector2i(900, 600),
				Title = "Rotating Bridge",

			};
			//create a new game object
			var mygame = new GameWindow(windowsettigs, nativeSettings);
			//attach code to execute when the game is loaded
			mygame.Load += Mygame_Load;
			mygame.RenderFrame += Mygame_RenderFrame;
			//run the game
			mygame.Run();

		}

		private static void Mygame_RenderFrame(OpenTK.Windowing.Common.FrameEventArgs obj)
		{

			GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit); // Clear the color and depth buffers

			Matrix4 modelview = Matrix4.LookAt(new Vector3(0, 0, 3), Vector3.Zero, Vector3.UnitY); // Create a modelview matrix
			GL.MatrixMode(MatrixMode.Modelview); // Set the matrix mode to modelview
			GL.LoadMatrix(ref modelview); // Load the modelview matrix

			GL.Color3(Color.Green); // Set the color to green
			GL.Begin(PrimitiveType.Quads); // Begin drawing a cube
			GL.Vertex3(-1.0f, -1.0f, 1.0f); // Front bottom left
			GL.Vertex3(1.0f, -1.0f, 1.0f); // Front bottom right
			GL.Vertex3(1.0f, 1.0f, 1.0f); // Front top right
			GL.Vertex3(-1.0f, 1.0f, 1.0f); // Front top left

			GL.Vertex3(-1.0f, -1.0f, -1.0f); // Back bottom left
			GL.Vertex3(1.0f, -1.0f, -1.0f); // Back bottom right
			GL.Vertex3(1.0f, 1.0f, -1.0f); // Back top right
			GL.Vertex3(-1.0f, 1.0f, -1.0f); // Back top left

			GL.Vertex3(-1.0f, 1.0f, 1.0f); // Left top front
			GL.Vertex3(-1.0f, 1.0f, -1.0f); // Left top back
			GL.Vertex3(-1.0f, -1.0f, -1.0f); // Left bottom back
			GL.Vertex3(-1.0f, -1.0f, 1.0f); // Left bottom front

		}

		private static void Mygame_Load()
		{
			//use open gl to draw a cube

			//set the color of the window to white
			GL.ClearColor(0.0f, 0.0f, 0.0f, 1.0f);


		}
	}
}