Open Source Extensible Enterprise n-tier Application Framework with Multilayered Architecture

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Web.UI.WebControls;
using SiberTek.Xenta.Presentation.Presenters;
using SiberTek.Xenta.Presentation.Views;
using SiberTek.Xenta.Web.Controls;

namespace SiberTek.Xenta.Web.Forum.Modules
{
    public partial class ForumDropDownList : ViewBase<ForumPresenter>, IDropDownList<Int32?>
    {
        #region Events
        public event EventHandler SelectedIndexChanged;
        #endregion

        #region Properties
        public int? ParentForumID
        {
            get
            {
                return null;
            }
        }

        public bool AutoPostBack
        {
            get
            {
                return lstForumList.AutoPostBack;
            }
            set
            {
                lstForumList.AutoPostBack = value;
            }
        }

        public bool AllowEmptyItem
        {
            get
            {
                return Convert.ToBoolean(ViewState["AllowEmptyItem"]);
            }
            set
            {
                ViewState["AllowEmptyItem"] = value;
            }
        }

        [Browsable(false)]
        public int? SelectedValue
        {
            get
            {
                return String.IsNullOrEmpty(lstForumList.SelectedValue) ? (int?)null : Int32.Parse(lstForumList.SelectedValue);
            }
            set
            {
                lstForumList.SelectedValue = value.HasValue ? value.Value.ToString() : String.Empty;
            }
        }

        public int ItemCount
        {
            get
            {
                return lstForumList.Items.Count;
            }
        }

        public bool Enabled
        {
            set
            {
                lstForumList.Enabled = value;
            }
        }
        #endregion

        #region Methods
        public override void BindData()
        {
            DataContainer["ShowHidden"] = false;
            DataContainer["ParentForumID"] = ParentForumID;

            Presenter.LoadCollection();

            lstForumList.Items.Clear();

            List<ViewDataContainer> itemCollection = DataContainer["ForumCollection"] as List<ViewDataContainer>;

            if(AllowEmptyItem)
            {
                lstForumList.Items.Add(new ListItem("-", String.Empty));
            }
            foreach(ViewDataContainer item in itemCollection)
            {
                lstForumList.Items.Add(new ListItem((string)item["Title"], item["ForumID"].ToString()));
            }

            base.BindData();
        }
        #endregion

        #region Handlers
        protected void LstForumList_OnSelectedIndexChanged(object sender, EventArgs e)
        {
            FireSelectedIndexChangedEvent();
        }
        #endregion

        #region Utilities
        private void FireSelectedIndexChangedEvent()
        {
            if(SelectedIndexChanged != null)
            {
                SelectedIndexChanged(this, EventArgs.Empty);
            }
        }
        #endregion
    }
}