Draw lines using sharpgl (C#).

I am trying to draw line in c# using sharpgl but when i compile the code it gives me the console with full of white color not the line,how to solve this this problem or is there any mistake in my code.Here is the code.


 private static int width = 400, height = 300;
static void Main(string[] args)
{

Glut.glutInit();
Glut.glutInitDisplayMode(Glut.GLUT_SINGLE | Glut.GLUT_RGB);
Glut.glutInitWindowSize(width, height);
Glut.glutCreateWindow("OpenGL Tutorial");

init();
Glut.glutDisplayFunc(OnDisplay);
Glut.glutMainLoop();
}
private static void OnDisplay()
{
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
Gl.glColor3f(0.0f, 0.4f, 0.2f);
Gl.glBegin(Gl.GL_LINES);

Gl.glVertex2i(180, 15);
Gl.glVertex2i(10, 145);
Gl.glEnd();
Gl.glFlush();
}
static void init()
{
Gl.glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
Gl.glMatrixMode(Gl.GL_PROJECTION);
// Gl.glLoadIdentity();
Gl.glOrtho(0.0, 200.0, 0.0, 1.0, -1.0, 1.0);

}