Implement Idle Timeout in Windows Forms Application using C#

Hi tpathan,

Use the System.Runtime.InteropServices LASTINPUTINFO class to get the IdleTime and LastInputTime.

Refer below code.

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Idle_Timeout_Windows_CS
{
    internal struct LASTINPUTINFO
    {
        public uint cbSize;
        public uint dwTime;
    }

    public partial class Form1 : Form
    {
        public static bool IsOpen { get; set; }
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Start();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            // Check idel time after 10 secs.
            if (GetIdleTime() > 10000 && !IsOpen)
            {
                MessageBox.Show("Your Session is expired.");
                IsOpen = true;
            }
        }

        [DllImport("User32.dll")]
        private static extern bool GetLastInputInfo(ref LASTINPUTINFO lastInputInfo);
        [DllImport("Kernel32.dll")]
        private static extern uint GetLastError();

        public static uint GetIdleTime()
        {
            LASTINPUTINFO lastUserAction = new LASTINPUTINFO();
            lastUserAction.cbSize = (uint)Marshal.SizeOf(lastUserAction);
            GetLastInputInfo(ref lastUserAction);
            return ((uint)Environment.TickCount - lastUserAction.dwTime);
        }

        public static long GetLastInputTime()
        {
            LASTINPUTINFO lastUserAction = new LASTINPUTINFO();
            lastUserAction.cbSize = (uint)Marshal.SizeOf(lastUserAction);
            if (!GetLastInputInfo(ref lastUserAction))
            {
                throw new Exception(GetLastError().ToString());
            }

            return lastUserAction.dwTime;
        }
    }
}