I converted the first example in Computer Graphics Using Open GL to C#, using the examples from the download as a template.

Here is the result:

using System;
using System.Drawing;
using System.Windows.Forms;
using CsGL.OpenGL;
public class DotsDemo : Form
{
MyView view = new MyView();
public DotsDemo()
{
    Text = "Dots demo !";
    view.Dock = DockStyle.Fill;
    Controls.Add( view );
}
public static void Main()
{
    DotsDemo di = new DotsDemo();
    Application.Run( di );
}
}
class MyView : OpenGLControl
{
public override void glDraw()
{
    GL.glClear( GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT ); // Clear Screen And Depth Buffer
    GL.glBegin( GL.GL_POINTS );
    GL.glVertex2i( 100, 50 );
    GL.glVertex2i( 100, 130 );
    GL.glVertex2i( 150, 130 );
    GL.glEnd();
    GL.glFlush();
}
protected override void InitGLContext()
{
    GL.glClearColor( 1.0f, 1.0f, 1.0f, 0.0f );
    GL.glColor3f( 0.0f, 0.0f, 0.0f );
    GL.glPointSize( 4.0f );
}
protected override void OnSizeChanged(EventArgs e)
{
    base.OnSizeChanged(e);
    GL.glMatrixMode(GL.GL_PROJECTION);
    GL.glLoadIdentity();
    GL.gluOrtho2D( 0.0, Size.Width, 0.0, Size.Height );
}
}

Be sure to add references to the OpenGL dlls: csgl-base, csgl-extensions, & csgl-opengl.

The program draws 3 dots in the lower left corner of the window.