problem with using text alongside the graphics

Hey everyone,

I am working on an engineering visualization program using OpenTK. I should display the amount of model rotation around x,y and z axes in every output that I get from my program. I am using the following sample code as the text and model renderer (both is done in the same function):

private void glControl1_Paint(object sender, PaintEventArgs e)
{
if (!loaded) return;

GL.MatrixMode(MatrixMode.Modelview);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.PushMatrix();

// When the user presses the arrow keys, zRot changes relevantly //
GL.Rotate(zRot, 0.0f, 0.0f, 1.0f);

ITextPrinter printer = new TextPrinter();
TextureFont font = new TextureFont(new Font(FontFamily.GenericSansSerif, 10f));
TextHandle[] handle = new TextHandle[1];
GL.Color3(0f, 1f, 0f);
printer.Prepare(zRot.ToString(), font, out handle[0]);
printer.Begin();
printer.Draw(handle[0]);
printer.End();
handle[0].Dispose();
font.Dispose();

//...
// ... Creating my simple models ...
//...

GL.PopMatrix();
glControl1.SwapBuffers();

}

The program , works fine, but after some rotation, the model stops rotating but the counter goes on counting. How I can solve the problem.

Thanks in forward.