Custom Controls ASP.Net Tutorial

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File: AdvancedCheckBox.cs
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace myControls
{
    public class AdvancedCheckBox : WebControl
    {
        private string _Text;
        private string _PostBackUrl;
        public string Text
        {
            get { return _Text; }
            set { _Text = value; }
        }
        public string PostBackUrl
        {
            get { return _PostBackUrl; }
            set { _PostBackUrl = value; }
        }
        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            PostBackOptions options = new PostBackOptions(this);
            options.ActionUrl = _PostBackUrl;
            string eRef = Page.ClientScript.GetPostBackEventReference(options);
            writer.AddAttribute(HtmlTextWriterAttribute.Onclick, eRef);
            writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "checkbox");
            base.AddAttributesToRender(writer);
        }
        protected override void RenderContents(HtmlTextWriter writer)
        {
            if (!String.IsNullOrEmpty(_Text))
            {
                writer.AddAttribute(HtmlTextWriterAttribute.For, this.ClientID);
                writer.RenderBeginTag(HtmlTextWriterTag.Label);
                writer.Write(_Text);
                writer.RenderEndTag();
            }
        }
        protected override HtmlTextWriterTag TagKey
        {
            get
            {
                return HtmlTextWriterTag.Input;
            }
        }
    }
}
File: Default.aspx
<%@ Page Language="C#" %>
<%@ Register TagPrefix="custom" Namespace="myControls" %>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    public string ProductName
    {
        get { return txtProductName.Text; }
    }



    Show AdvancedCheckBox


    
    

            id="lblProductName"
        Text="Product Name:"
        AssociatedControlID="txtProductName"
        Runat="server" />
            id="txtProductName"
        Runat="server" />
    
            id="AdvancedCheckBox1"
        Text="Advanced Options"
        PostBackUrl="AdvancedOptions.aspx"
        Runat="server" />