Delegates Events Ex-3

public partial class buttonEvent : System.Web.UI.Page

{

    

    public delegate void ButtonEventHandler(object sender, CustomEventArgs args);

    public event ButtonEventHandler ButtonClicked;

    protected void Page_Load(object sender, EventArgs e)

    {

        ButtonClicked += clsSubscriber.OnButtonClicked;

        if (!Page.IsPostBack)

        {

             ViewState["Counter"] = 0;

             Response.Write(ViewState["Counter"] ?? 0);

        }

        else

        {

           // Response.Write(ViewState["Counter"] ?? 0);

        }

    }

    public virtual void OnButtonClicked(object sender, CustomEventArgs args)

    {

        ButtonClicked?.Invoke(this, args);

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

      

        ViewState["Counter"] = Convert.ToInt32(ViewState["Counter"]) + 1;

        CustomEventArgs x = new CustomEventArgs();

        x.strButtonID = this.ClientID;

        x.MyCounter = Convert.ToInt32(ViewState["Counter"]);

        x.Message = x.strButtonID + "Button Clicked.";

        OnButtonClicked(this, x);

    }

}

public class CustomEventArgs : EventArgs

{

    public string strButtonID { get; set; }

    public int MyCounter { get; set; }

    public string Message { get; set; }

}

public static class clsSubscriber

{

    public static void OnButtonClicked(object sender, CustomEventArgs args)

    {

        HttpContext.Current.Response.Write("The Counter is : " + args.MyCounter);

        HttpContext.Current.Response.Write(args.Message);

    }

}

Posted in: C#,Delegate,Events