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protected override void OnPaint(PaintEventArgs e)
{
    device.Clear(ClearFlags.Target, Color.Black, 1.0f, 0); // Clear window
    device.BeginScene();
    sprite.Begin(SpriteFlags.AlphaBlend);


    Rectangle textureSize;
    using (Surface surface = textur.GetSurfaceLevel(0))
    {
        SurfaceDescription surfaceDescription = surface.Description;
        textureSize = new Rectangle(0, 0, surfaceDescription.Width, surfaceDescription.Height);
    }
    sprite.Draw(textur, textureSize, Vector3.Empty, Vector3.Empty, Color.White);


    sprite.End();
    device.EndScene();
    device.Present();

    Invalidate();
}                    

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PresentParameters pps = new PresentParameters();
pps.Windowed = true;
pps.SwapEffect = SwapEffect.Discard;
pps.BackBufferFormat = Format.Unknown;
device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, pps);
device.RenderState.SourceBlend = Blend.One;
device.RenderState.DestinationBlend = Blend.One;
device.RenderState.AlphaBlendEnable = true;

sprite = new Sprite(device);