Unable to find an entry point exception OGL C#

Please see here[^] for an explanation on why you are getting the error.

As for the troubleshooting, were you able to take a look at the following forums?
http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=130422[^]
http://www.gamedev.net/topic/465618-how-do-i-use-multiple-textures-in-opengl-in-vbnet/[^]

For sorry i am using OpenGl at Tao framework at C# not VB Or C++.

and my old project was so so simple but i couldn't find the differences of them

any ideas ???

Hi,

glActiveTexture is not an exported function of opengl32.dll.
You can use this opengl extension for multi-texturing. You need to get function address of glAtiveTexture using glGetProcAddress. May be Tao framework will handle it.

Possibly your machine do not have ARB_multitexture extension. And therefore glGetProcAddress("glAtiveTexture") will return 0.

glActiveTexture is only supported if the GL version is 1.3 or greater, or if ARB_multitexture is included in the string returned by glGetString when called with the argument GL_EXTENSIONS.

http://www.opengl.org/sdk/docs/man/xhtml/glActiveTexture.xml[^]

Please check your machine have ARB_multitexture extension support.

You can use following application to view opengl extensions in your machine.
http://www.realtech-vr.com/glview/download.html[^]

You mean the same application( or code ) running in same machine ?

If so you have to check initialisation of OpenGL rendering context in your calling thread.
Maybe Tao frmework have some Intialize() calls for OpenGL rendering Context.

To get access to an OpenGL extension, you need to initialize rendering context.
If OpenGL rendering context is not correct you can't access some extensions.

Is there any change to your rendering window ?