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public partial class Form1 : Form
{
System.Windows.Forms.Timer timer = new Timer();
public Form1()
{
InitializeComponent();
timer.Interval = 30 * 1000;
timer.Tick += delegate { SetThreadExecutionState(3); }; //<---
timer.Start();
}
[DllImport("kernel32")]
extern static int SetThreadExecutionState(int esFlags);
}