请教WM手机软件开发中怎么打开屏幕呢

请问WM手机软件开发中如何打开屏幕呢
我在做一个定时的软件（C#），现在到了时间它会自动执行一个程序，但是屏幕却还是关闭的状态下，请问怎么开启屏幕呢，谢谢大家！最好能给源码，我百度谷歌找了好久没找到。

------解决方案--------------------

C# code


 public enum PowerState//电池状态
        {
            PwrDeviceUnspecified = -1,
            FullOn = 0,           
            LowOn = 1,           
            Standby = 2,         
            Sleep = 3,         
            Off = 4,   
            PwrDeviceMaximum = 5
        }
        [DllImport("CoreDll", SetLastError = true)]
        static extern IntPtr SetPowerRequirement(string DeviceName, PowerState State, uint dwDeviceFlags, string Name, ulong Reserved);

        [DllImport("CoreDll", SetLastError = true)]
        static extern int ReleasePowerRequirement(IntPtr hPowerReq);

        [DllImport("coredll.dll")]
        private static extern int DevicePowerNotify(string device, PowerState deviceState, int deviceFlags);

DevicePowerNotify("BKL1:", PowerState.FullOn, 1);//开背景灯
DevicePowerNotify("BKL1:", PowerState.Off, 1);//关背景灯

请教WM手机软件开发中怎么打开屏幕呢

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