Reading from Web.Config in an ASP.Net Application

using System;
using System.Xml;
using System.Web.UI;
using System.IO;
using System.Web;
using System.Collections;

namespace MyApp.Utility
{
   public class GetFromWebConfig
  {
     protected static Hashtable cachedValues = new Hashtable();
     protected static string fileName;

  static GetFromWebConfig()
     {
        fileName = "c:\directorypath\web.config";
\\substitute "directorypath" with the locacation of your
\\web.config file
     XmlDocument doc = new XmlDocument();
     doc.Load(fileName);
     XmlNode oNode =   doc.DocumentElement.SelectSingleNode("appSettings");
     for (int i = 0;i < oNode.ChildNodes.Count;i++)
    {
      string key = oNode.ChildNodes.Item(i).Attributes.Item(0).Value;
      string data = oNode.ChildNodes.Item(i).Attributes.Item(1).Value;
      cachedValues.Add(key, data);
    }
  }

  public static string getFromAppSettings(string KeyName)
  {
    object result = cachedValues[KeyName];
    if(result == null)
    {
      return String.Empty;
    }
    return result.ToString();
  }
 }
}

Assuming your web.config looks something like this

  <appSettings>
   <add key="MyWebsiteRootPath" value="C:\MyWebSite"/> 
    <add key="UploadDir" value="\MyWebSite\Upload\"/>
   <add key="ImageDirectory"  value="MyWebSite\Images\"/>
  </appSettings>

GetFromWebConfig.getFromAppSettings("ImageDirectory") will return "MyWebSite\Images\"/>