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Implementing double click event using timer
#region Timer Mouse Double Click event

    timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);

    //Here, the timer for Timer click event will start when mouse hovers over an area
    private void form_MouseHover(object sender, System.EventArgs e)
    {
        timer.Start();
    }

    private void form_MouseLeave(object sender, System.EventArgs e)
    {
        timer.Stop();
    }

    void timer_Elapsed(object sender, ElapsedEventArgs e)
    {
        timer.Stop();
        DoubleClickEvent();
    }

    //This method allows the user to click a file/folder by hovering/keeping still the mouse for specified time
    void DoubleClickEvent()
    {

        DoClickMouse(0x2);      // Left mouse button down
        DoClickMouse(0x4);      // Left mouse button up
    }

    static void DoClickMouse(int mouseButton)
    {
        var input = new INPUT()
        {
            dwType = 0, // Mouse input
            mi = new MOUSEINPUT() { dwFlags = mouseButton }
        };

        if (SendInput(1, input, Marshal.SizeOf(input)) == 0)
        {
            throw new Exception();
        }
    }
    [StructLayout(LayoutKind.Sequential)]
    struct MOUSEINPUT
    {
        int dx;
        int dy;
        int mouseData;
        public int dwFlags;
        int time;
        IntPtr dwExtraInfo;
    }
    struct INPUT
    {
        public uint dwType;
        public MOUSEINPUT mi;
    }
    [DllImport("user32.dll", SetLastError = true)]
    static extern uint SendInput(uint cInputs, INPUT input, int size);

    #endregion

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

        this.MouseHover += new EventHandler(MouseHoverEvent);
        this.MouseLeave +=new EventHandler(MouseLeaveEvent);
        timer1.Tick += new EventHandler(timer1_Tick);

        foreach (Control item in this.Controls)
        {
            item.MouseHover += new EventHandler(MouseHoverEvent);
            item.MouseLeave += new EventHandler(MouseLeaveEvent);
        }

    }

    void timer1_Tick(object sender, EventArgs e)
    {
        timer1.Stop();
        DoubleClickEvent();
    }

    void MouseLeaveEvent(object sender, EventArgs e)
    {
        timer1.Stop();
    }

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

void DoubleClickEvent()
{
    DoClickMouse(0x2);      // Left mouse button down
    DoClickMouse(0x4);      // Left mouse button up
    DoClickMouse(0x2);      // Left mouse button down
    DoClickMouse(0x4);      // Left mouse button up
}