private void pattern_cube()
        {
                FileStream fS = new FileStream(@"texture.raw", FileMode.Open);  // Einlesen der Bilddatei als FileStream
                int length = (int)fS.Length;
                int sum = 0;
                int count = 0;
                byte[] texture = new byte[length];
                while ((count = fS.Read(texture, sum, length - sum)) > 0)   // FileStream/Bilddatei wird auf
                    sum += count;                                           // ein ByteArray geschrieben
                fS.Close();

                Gl.glEnable(Gl.GL_TEXTURE_2D);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR);
                Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGB, 512, 512, 0, Gl.GL_RGB, Gl.GL_UNSIGNED_BYTE, texture);
                Gl.glClear(Gl.GL_DEPTH_BUFFER_BIT);
                Gl.glEnable(Gl.GL_DEPTH_TEST);

                Gl.glBegin(Gl.GL_QUADS);
                    Gl.glColor3f(1.0f, 1.0f, 1.0f);
                    Gl.glBindTexture(Gl.GL_TEXTURE_2D, 13);

                    Gl.glTexCoord2f(0.0f, 0.0f);
                    Gl.glVertex3f(right[0, 0], right[0, 1], right[0, 2]);
                    Gl.glTexCoord2f(1.0f, 0.0f);
                    Gl.glVertex3f(right[1, 0], right[1, 1], right[1, 2]);
                    Gl.glTexCoord2f(1.0f, 1.0f);
                    Gl.glVertex3f(right[2, 0], right[2, 1], right[2, 2]);
                    Gl.glTexCoord2f(0.0f, 1.0f);
                    Gl.glVertex3f(right[3, 0], right[3, 1], right[3, 2]);

                    Gl.glTexCoord2f(0.0f, 0.0f);
                    Gl.glVertex3f(left[0, 0], left[0, 1], left[0, 2]);
                    Gl.glTexCoord2f(1.0f, 0.0f);
                    Gl.glVertex3f(left[1, 0], left[1, 1], left[1, 2]);
                    Gl.glTexCoord2f(1.0f, 1.0f);
                    Gl.glVertex3f(left[2, 0], left[2, 1], left[2, 2]);
                    Gl.glTexCoord2f(0.0f, 1.0f);
                    Gl.glVertex3f(left[3, 0], left[3, 1], left[3, 2]);

                    Gl.glTexCoord2f(0.0f, 0.0f);
                    Gl.glVertex3f(up[0, 0], up[0, 1], up[0, 2]);
                    Gl.glTexCoord2f(1.0f, 0.0f);
                    Gl.glVertex3f(up[1, 0], up[1, 1], up[1, 2]);
                    Gl.glTexCoord2f(1.0f, 1.0f);
                    Gl.glVertex3f(up[2, 0], up[2, 1], up[2, 2]);
                    Gl.glTexCoord2f(0.0f, 1.0f);
                    Gl.glVertex3f(up[3, 0], up[3, 1], up[3, 2]);

                    Gl.glTexCoord2f(0.0f, 0.0f);
                    Gl.glVertex3f(down[0, 0], down[0, 1], down[0, 2]);
                    Gl.glTexCoord2f(1.0f, 0.0f);
                    Gl.glVertex3f(down[1, 0], down[1, 1], down[1, 2]);
                    Gl.glTexCoord2f(1.0f, 1.0f);
                    Gl.glVertex3f(down[2, 0], down[2, 1], down[2, 2]);
                    Gl.glTexCoord2f(0.0f, 1.0f);
                    Gl.glVertex3f(down[3, 0], down[3, 1], down[3, 2]);

                    Gl.glTexCoord2f(0.0f, 0.0f);
                    Gl.glVertex3f(back[0, 0], back[0, 1], back[0, 2]);
                    Gl.glTexCoord2f(1.0f, 0.0f);
                    Gl.glVertex3f(back[1, 0], back[1, 1], back[1, 2]);
                    Gl.glTexCoord2f(1.0f, 1.0f);
                    Gl.glVertex3f(back[2, 0], back[2, 1], back[2, 2]);
                    Gl.glTexCoord2f(0.0f, 1.0f);
                    Gl.glVertex3f(back[3, 0], back[3, 1], back[3, 2]);

                    Gl.glTexCoord2f(0.0f, 0.0f);
                    Gl.glVertex3f(top[0, 0], top[0, 1], top[0, 2]);
                    Gl.glTexCoord2f(1.0f, 0.0f);
                    Gl.glVertex3f(top[1, 0], top[1, 1], top[1, 2]);
                    Gl.glTexCoord2f(1.0f, 1.0f);
                    Gl.glVertex3f(top[2, 0], top[2, 1], top[2, 2]);
                    Gl.glTexCoord2f(0.0f, 1.0f);
                    Gl.glVertex3f(top[3, 0], top[3, 1], top[3, 2]);
                    Gl.glEnd();

                Gl.glDisable(Gl.GL_TEXTURE_2D);

        }


//vorher noch als namespace: using System.IO;  aber das hast du glaub ich schon :D