i have problem with multitexturing in csgl:/ I was searching this error 3h :/ Look at code: public OpenGLTExture2D tex,tex2; // //funcion to add new textures private OpenGLTexture2D LoadTexture(string path) { return new OpenGLTexture2D(path); } ..... in Init opengl I add 2 new texture tex = LoadTexture("1.jpg"); tex2 = LoadTexture("2.jpg"); and render this shit in main loop (in this code program was crash) : tex.glActiveTextureARB(GL.GL_TEXTURE0_ARB); GL.glBindTexture(GL.GL_TEXTURE_2D, tex.ID); GL.glEnable(GL.GL_TEXTURE_2D); tex.glActiveTextureARB(GL.GL_TEXTURE1_ARB); GL.glBindTexture(GL.GL_TEXTURE_2D, tex2.ID); GL.glEnable(GL.GL_TEXTURE_2D); GL.glBegin(GL.GL_QUADS); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE0_ARB, 0, 0); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE1_ARB, 0, 0); GL. glVertex3f(-1.0f, -1.0f, 1.0f); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE0_ARB, 1, 0); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE1_ARB, 1, 0); GL.glVertex3f( 1.0f, -1.0f, 1.0f); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE0_ARB, 1, 1); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE1_ARB, 1, 1); GL.glVertex3f( 1.0f, 1.0f, 1.0f); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE0_ARB, 0, 1); tex.glMultiTexCoord2fARB(GL.GL_TEXTURE1_ARB, 0, 1); GL.glVertex3f(-1.0f, 1.0f, 1.0f); GL.glEnd(); do you know what is wrong? Plise helpe me! Thanks!