Building ASP.NET Server Controls-Textbox.cs

// Title: Building ASP.NET Server Controls
//
// Chapter: 4 - State Management
// File: Textbox.cs
// Written by: Dale Michalk and Rob Cameron
//
// Copyright ?2003, Apress L.P.
using System;
using System.Web;
using System.Web.UI;
using System.Collections.Specialized;
using System.ComponentModel;

namespace ControlsBookLib.Ch04
{
[ToolboxData("<{0}:Textbox runat=server></{0}:Textbox>"),
DefaultProperty("Text")]
public class Textbox : Control, IPostBackDataHandler
{
public virtual string Text
{
get
{
object text = ViewState["Text"];
if (text == null)
return string.Empty;
else
return (string) text;
}
set
{
ViewState["Text"] = value;
}
}

public bool LoadPostData(string postDataKey,
NameValueCollection postCollection)
{
string postedValue = postCollection[postDataKey];
Text = postedValue;
return false;
}

public virtual void RaisePostDataChangedEvent()
{

}

override protected void Render(HtmlTextWriter writer)
{
Page.VerifyRenderingInServerForm(this);

base.Render(writer);

// write out the <INPUT type="text"> tag
writer.Write("<INPUT type=\"text\" name=\"");
writer.Write(this.UniqueID);
writer.Write("\" value=\"" + this.Text + "\" />");
}
}
}