Custom Membership, Role Providers, Website administration tool, and Role based access to individual files

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for CheckBoxListEx
/// </summary>
public class CheckBoxListEx : CheckBoxList
{
    [Themeable(false)]
    public string DataSelectedField
    {
        get
        {
            object o = this.ViewState["DataSelectedField"];
            return (o != null) ? (string)o : string.Empty;
        }
        set
        {
            this.ViewState["DataSelectedField"] = value;
            if (base.Initialized)
            {
                base.RequiresDataBinding = true;
            }
        }
    }

    protected override void PerformDataBinding(System.Collections.IEnumerable dataSource)
    {
        base.PerformDataBinding(dataSource);

        if (DataSelectedField.Length > 0)
        {
            foreach (object row in dataSource)
            {
                ListItem li = this.Items.FindByValue(DataBinder.GetPropertyValue(row, this.DataValueField, null));
                li.Selected = (bool)DataBinder.GetPropertyValue(row, this.DataSelectedField);
            }
        }
    }
}