Resolution Set

void PreparingDeviceSettingsCallback(object sender, PreparingDeviceSettingsEventArgs e)
{
    e.GraphicsDeviceInformation.CreationOptions = CreateOptions.SinglePrecision & CreateOptions.HardwareVertexProcessing;

    DisplayMode Mode = new DisplayMode();
    foreach (DisplayMode D in GraphicsAdapter.DefaultAdapter.SupportedDisplayModes)
    {
        Mode = D;
    }

    e.GraphicsDeviceInformation.PresentationParameters.BackBufferWidth = Mode.Width;
    e.GraphicsDeviceInformation.PresentationParameters.BackBufferHeight = Mode.Height;
    e.GraphicsDeviceInformation.PresentationParameters.BackBufferFormat = Mode.Format;
    e.GraphicsDeviceInformation.PresentationParameters.FullScreenRefreshRateInHz = Mode.RefreshRate;
}