Configuration ASP.Net Tutorial

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"  Inherits="Welcome_aspx" %>



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File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Configuration;
public partial class Welcome_aspx : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    Configuration config = WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
    
    lblSiteName.Text = config.AppSettings.Settings["websiteName"].Value;
    lblWelcome.Text = config.AppSettings.Settings["welcomeMessage"].Value;
    if (config.AppSettings.Settings["welcomeMessage"].Value.Length > 15)
    {
      config.AppSettings.Settings["welcomeMessage"].Value = "Welcome, again.";
    }
    else
    {
      config.AppSettings.Settings["welcomeMessage"].Value = "Welcome, friend.";
    }
    config.Save();
    
  }
}
File: Web.config