Using EventWaitHanldes between Windows Service and Windows Application

I have a requirement to send signal from a Windows Service to a Windows console/Forms application using Named Events. I created a common NamedEvents class library which has the implementation to create events. The issue is that my windows service is not creating event. If I create another Windows Forms application(in place of windows service) to create a event then it works fine. But with Windows Service it doesn't seem to work, Can please someone advice me if I am missing something in my code

public static class NamedEvents
 {
    public static EventWaitHandle OpenOrCreate(string name, bool  initialState, EventResetMode mode)
    {
        EventWaitHandle ewh = null;
        try
        {                
            ewh = EventWaitHandle.OpenExisting(name);
        }
        catch (WaitHandleCannotBeOpenedException)
        {                
            ewh = new EventWaitHandle(initialState, mode, name);
        }

        return ewh;
    }

    public static EventWaitHandle OpenOrWait(string name)
    {
        EventWaitHandle ewh = null;

        while (null == ewh)
        {
            try
            {
                ewh = EventWaitHandle.OpenExisting(name);
            }
            catch (WaitHandleCannotBeOpenedException)
            {
                Thread.Sleep(50);
            }
        }

        return ewh;
    }
} 

Windows Service Code:

 public void SetSignalToClient()
 {
 EventWaitHandle completedA = NamedEvents.OpenOrCreate("CompletedA", false,   EventResetMode.ManualReset);                     
        completedA.Set();
        completedA.Close();

}

Windows Forms Application:

 public Form1()
    {
        InitializeComponent();
        new Task((o) => SubscribeToAsyncEvents(),
            new System.Threading.CancellationToken()).Start(); 
    }



    private void SubscribeToAsyncEvents()
    {            
        while (true)
        {
            EventWaitHandle completedA = NamedEvents.OpenOrWait("CompletedA");
            completedA.WaitOne();
          if (textBox1.InvokeRequired)

            {

            textBox1.Invoke((MethodInvoker)delegate { textBox1.Text = "received"; });

            }
            completedA.Close();               
        }
    }