. Net first Server Control

using System;using System.Collections.Generic;using System.ComponentModel;using System.Linq;using System.Text;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace SKTControl{    [DefaultProperty("Text")]    [ToolboxData("<{0}:ServerControl1 runat=server></{0}:ServerControl1>")]    public class Hello : WebControl    {        [Bindable(true)]        [Category("Appearance")]        [DefaultValue("")]        [Localizable(true)]        public string Text        {            get            {                String s = (String)ViewState["Text"];                return ((s == null) ? "[" + this.ID + "]" : s);            }            set            {                ViewState["Text"] = value;            }        }        protected override void RenderContents(HtmlTextWriter output)        {            output.Write(Text);        }    }}

Register components:

<system.web>    <pages>      <controls>        <add tagPrefix="uc" namespace="SKTControl" assembly="SKTControl,Version=1.0" />      </controls>    </pages>  </system.web>

Call:

<uc:hello ID="hello" runat="server"></uc:hello>

Result: [Hello]