How to call custom Class Library function in Windows Forms Application using C#

Hi Everyone,

I just Write below code in "ClassLibrary" i just want to handle the "endTime" Event in my Windows Form
how can I do please give mw Solution As soon As Fast.
       

public class EndSchedular
{
    
    public delegate void UpdateStatus(string newStatus);
    public event UpdateStatus ups;
    public void End()
    {

        string end = DateTime.Now.ToString("HH:mm tt");
        MessageBox.Show(end);
    }

    public void endTime(object sender, UpdateStatus e)
    {
   
}