Hi all I am learning the tutorial from NeHe website. In lesson 6, i got this error from the define the texture array. GLuint texture[1]; error C4368: cannot define 'texture' as a member of managed 'opengl_picturebox_test::Form1': mixed types are not supported this the the stuff i have included #include <windows.h> #include <stdio.h> #include <gl\glut.h> #include <gl\gl.h> #include <gl\glu.h> #include "BMP.h" #include "stdafx.h" also i have include the libraries list in lesson 6. Multi-Byte Character Set was used. By the way i am testing this tutorial in a windows form, is this ganna be any differences ?? Anyone has a solution for this problem?? Thanks a lot...