I have a little problem with my program. I have a class like this: class board { public: void render(float *t); // Methods board(LPDIRECT3DDEVICE8 g_pd3dDevice); virtual ~board(); // Variable & Objects LPDIRECT3DDEVICE8 mD3D; FONT2DVERTEX *v; LPDIRECT3DTEXTURE8 *m_pTexture; LPDIRECT3DVERTEXBUFFER8 m_pVB; }; the constructor is : board::board(LPDIRECT3DDEVICE8 g_pd3dDevice) { mD3D=g_pd3dDevice; m_pTexture=NULL; DWORD m_dwTexWidth=256; DWORD m_dwTexHeight=256; D3DCAPS8 d3dCaps; mD3D->GetDeviceCaps( &d3dCaps ); // Create a new texture for the font HRESULT hr = mD3D->CreateTexture( m_dwTexWidth, m_dwTexHeight, 1, 0, D3DFMT_A4R4G4B4, D3DPOOL_MANAGED, m_pTexture ); if( FAILED(hr) ) exit(0); } It''s compile very well, but at the execution the program exit and the debugor send me : Direct3D8: (ERROR) :Bad parameter passed pTexture. CreateTexture failedFirst-chance exception in 3d.exe (KERNEL32.DLL): 0xC0000005: Access Violation. Direct3D8: (ERROR) :Failure trying to create a texture But when I do this change : board::board(LPDIRECT3DDEVICE8 g_pd3dDevice) { mD3D=g_pd3dDevice; LPDIRECT3DTEXTURE8 pTexture; DWORD m_dwTexWidth=256; DWORD m_dwTexHeight=256; D3DCAPS8 d3dCaps; mD3D->GetDeviceCaps( &d3dCaps ); // Create a new texture for the font HRESULT hr = mD3D->CreateTexture( m_dwTexWidth, m_dwTexHeight, 1, 0, D3DFMT_A4R4G4B4, D3DPOOL_MANAGED, &pTexture ); if( FAILED(hr) ) exit(0); } the program work fine. What''s wrong with this strange Trouble. Thanks in advance.