EnhancedCheckboxList.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Collections;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Testing
{
    public class EnhancedCheckboxList : System.Web.UI.WebControls.CheckBoxList
    {
        public string DataEnabledField
        {
            get
            {
                string s = (string)ViewState["DataEnabledField"];
                return (s == null) ? String.Empty : s;
            }
            set
            {
                ViewState["DataEnabledField"] = value;
                if (Initialized)
                    OnDataPropertyChanged();
            }
        }

        public string DataCheckedField
        {
            get
            {
                string s = (string)ViewState["DataCheckedField"];
                return (s == null) ? String.Empty : s;
            }
            set
            {
                ViewState["DataCheckedField"] = value;
                if (Initialized)
                    OnDataPropertyChanged();
            }
        }

        protected override void PerformDataBinding(IEnumerable dataSource)
        {
            if (dataSource != null)
            {
                bool hasSelectedField = DataCheckedField.Length != 0;
                bool hasEnabledField = DataEnabledField.Length != 0;

                if (!this.AppendDataBoundItems)
                    this.Items.Clear();

                if (dataSource is ICollection)
                    this.Items.Capacity = (dataSource as ICollection).Count + this.Items.Count;

                foreach (object dataItem in dataSource)
                {
                    ListItem item = new ListItem()
                    {
                        Text = DataBinder.GetPropertyValue(dataItem, DataTextField).ToString(),
                        Value = DataBinder.GetPropertyValue(dataItem, DataValueField).ToString(),
                        Selected = hasSelectedField ? (bool)DataBinder.GetPropertyValue(dataItem, DataCheckedField) : false,
                        Enabled = hasEnabledField ? (bool)DataBinder.GetPropertyValue(dataItem, DataEnabledField) : true
                    };
                    this.Items.Add(item);
                }
            }
        }
    }
}