help with texture when reset

I''ve tried and test many ways but always failed to reset the device when there is a texture.I''ve tried to create texture with Pool.Managed or Pool.Default, and recreated with Pool.Default when reset. but it always failed in DrawPrimitives. When no texture, no matter what type resource of the VertexBuffer is, the rendering is ok. Can you tell me how can I to test where is the problem? Thank you!