[DefaultProperty("Text")]
    [ToolboxData("<{0}:CustomUserName runat=Server></{0}:CustomUserName>")]
    public class CustomUserName:WebControl,IPostBackDataHandler 
    {
        [Category("Appearance")]
        [DefaultValue("")]
        [Bindable(true)]
        [Localizable(true)]
        public string Text
        {   
            
            get { return ViewState["Text"] != null ? (string)ViewState["Text"] : string.Empty; }
            set { ViewState["Text"] = value; }
        }
        private static readonly object EventTextChanged = new object();
        public event EventHandler TextChanged
        {
            add { Events.AddHandler(EventTextChanged, value);}
            remove { Events.RemoveHandler(EventTextChanged,value);}
        }
        private void OnTextChanged(EventArgs eventArgs)
        {
            EventHandler textChangeHandler = Events[EventTextChanged] as EventHandler;
            if (textChangeHandler != null)
            {
                textChangeHandler(this, eventArgs);
            }
        }

        protected override void RenderContents(HtmlTextWriter writer)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "text");
            writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
            writer.RenderBeginTag(HtmlTextWriterTag.Input);
            writer.RenderEndTag();
        }

        bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
        {
            string postValue = postCollection[postDataKey];
            if (postValue != Text)
            {
                Text = postValue;
                return true;
            }
            return false;
        }

        void IPostBackDataHandler.RaisePostDataChangedEvent()
        {
            OnTextChanged(EventArgs.Empty);
        }
    }