How to Turn OFF the Display using C# -WINDOWS FORM

Turning OFF the Display using C#

first of all , you need to use that library :

Code:

using System.Runtime.InteropServices; // for dll import

Then add these under public class :

Code:

//Using the system pre-defined MSDN constants that can b used by the SendMessage()

       

        public int WM_SYSCOMMAND = 0x0112;

        public int SC_MONITORPOWER = 0xF170;

        //To call a DLL function from C#, you must provide this declaration .

        [DllImport("user32.dll")]

    private static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);

Finally when button clicked , add this function :

Code:

            // this will turn off display

            SendMessage(this.Handle.ToInt32(), WM_SYSCOMMAND, SC_MONITORPOWER, 2);