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using System.Runtime.InteropServices; const int WM_SYSCOMMAND = 0x0112; const int SC_MONITORPOWER = 0xF170; const int MONITOR_ON = -1; const int MONITOR_OFF = 2; const int MONITOR_STANBY = 1; [DllImport("user32.dll")] private static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam); // Monitor On SendMessage(this.Handle.ToInt32(), WM_SYSCOMMAND, SC_MONITORPOWER, MONITOR_ON); // ..