Using-a-ControlBuilder


            File: ServerTabs.cs
using System;
using System.Collections;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace myControls
{
    [ControlBuilder(typeof(ServerTabsBuilder))]
    [ParseChildren(false)]
    public class ServerTabs : WebControl, IPostBackEventHandler
    {
        public int SelectedTabIndex
        {
            get
            {
                if (ViewState["SelectedTabIndex"] == null)
                    return 0;
                else
                    return (int)ViewState["SelectedTabIndex"];
            }            set
            {
                ViewState["SelectedTabIndex"] = value;
            }
        }
        protected override void RenderContents(HtmlTextWriter writer)
        {
            for (int i = 0; i < this.Controls.Count; i++)
            {
                ServerTab tab = (ServerTab)this.Controls[i];
                string eRef = Page.ClientScript.GetPostBackClientHyperlink(this,  i.ToString());
                if (SelectedTabIndex == i)
                    writer.AddAttribute(HtmlTextWriterAttribute.Class, "tab  selectedTab");
                else
                    writer.AddAttribute(HtmlTextWriterAttribute.Class, "tab");
                writer.RenderBeginTag(HtmlTextWriterTag.Div);
                writer.AddAttribute(HtmlTextWriterAttribute.Href, eRef);
                writer.RenderBeginTag(HtmlTextWriterTag.A);
                writer.Write(tab.Text);
                writer.RenderEndTag();
            }
            writer.Write("");
            writer.AddAttribute(HtmlTextWriterAttribute.Class, "tabContents");
            writer.RenderBeginTag(HtmlTextWriterTag.Div);
            this.Controls[SelectedTabIndex].RenderControl(writer);
            writer.RenderEndTag(); 
        }
        protected override void AddParsedSubObject(object obj)
        {
            if (obj is ServerTab)
                base.AddParsedSubObject(obj);
        }
        protected override HtmlTextWriterTag TagKey
        {
            get
            {
                return HtmlTextWriterTag.Div;
            }
        }
        public void RaisePostBackEvent(string eventArgument)
        {
            SelectedTabIndex = Int32.Parse(eventArgument);
        }
    }
    public class ServerTabsBuilder : ControlBuilder
    {
        public override Type GetChildControlType(string tagName, IDictionary attribs)
        {
            if (String.Compare(tagName, "tab", true) == 0)
                return typeof(ServerTab);
            else
                return null;
        }
    }
    public class ServerTab : Control
    {
        private string _Text;
        public string Text
        {
            get { return _Text; }
            set { _Text = value; }
        }
    }
}
            
File: ShowServerTabs.aspx
<%@ Page Language="C#" %>
<%@ Register TagPrefix="custom" Namespace="myControls" %>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


    
        .tab
        {
            float:left;
            position:relative;
            top:1px;
            background-color:#eeeeee;
            border:solid 1px black;
            padding:0px 15px;
            margin-left:5px;
        }
        .tab a
        {
            text-decoration:none;
        }
        .selectedTab
        {
            background-color:white;
            border-bottom:solid 1px white;
        }
        .tabContents
        {
            border:solid 1px black;
            background-color:white;
            padding:10px;
            height:200px;
        }
    
    Show ServerTabs


    
    
            ID="ServerTabs1"
        Runat="Server">
        
          Contents of the first tab
        
        
          Contents of the second tab
        
        
          Contents of the third tab
Custom Controls ASP.Net Tutorial
