C#

<?xml version="1.0" encoding="utf-8" ?>

<Units>
  <Unt Text="stuks" Service="False" Value="0" />
  <Unit Text="km" Service="True" Value="1" />
</Units>

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="Unit" targetNamespace="http://tempuri.org/Unit.xsd" elementFormDefault="qualified" xmlns="http://tempuri.org/Unit.xsd"
           xmlns:mstns="http://tempuri.org/Unit.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:complexType name="UnitType">
    <xs:attribute name="Text" type="xs:string" use="required" />
    <xs:attribute name="Service" type="xs:boolean" use="required" />
    <xs:attribute name="Value" type="xs:byte" use="required" />
  </xs:complexType>

  <xs:element name="Units">
    <xs:complexType>
      <xs:sequence minOccurs="0" maxOccurs="unbounded">
        <xs:element name="Unit" type="UnitType" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>

</xs:schema>

Settings = new XmlReaderSettings();
Settings.ValidationType = ValidationType.Schema;
Settings.Schemas.Add("http://tempuri.org/Unit.xsd", Directory.GetCurrentDirectory() + strXmlSchema);
Settings.ValidationEventHandler += new ValidationEventHandler(OnSchemaValidationError);

using (XmlReader Reader = XmlReader.Create(Directory.GetCurrentDirectory() + strXmlFile, Settings))
{
    if (Reader != null)
    {
        XmlDocument Doc = new XmlDocument();
        Doc.Load(Reader);
        Reader.Close();
        :
    }
}

List<string> rangeDataMappingsToClear= new List<string>();
Dictionary<string, object> rangeDataMappings = new Dictionary<string, object>();
Dictionary<string, List<string>> rangeKeyMappings = new Dictionary<string, List<string>>();

foreach (string key in rangeDataMappingsToClear)
                {
                    rangeDataMappings.Remove(key);
               foreach (List<string> formulaKeys in rangeKeyMappings.Values)
                    {
                        while (formulaKeys.Remove(key)) { }
                    }
                }
                rangeDataMappingsToClear.Clear();

/// <summary>
       /// event fire when the user 1st browse the website
       /// </summary>
       protected void Application_PreRequestHandlerExecute(object sender, EventArgs e)
       {
           //Response.Write("Fire up");

           //if session items is not null
           if (HttpContext.Current.Session != null)
           {
               Response.Write("SessionID:" + Session.SessionID.ToString() + "User Key:" +(string)Session["users"]);

               //fires after initial login
               if (Session["users"] != null)
               {


                  String sKey= (string)Session["users"];
                  string sUser = (String)HttpContext.Current.Cache[sKey];
               }
               //remove the cache item if session is over
               else
               {

                   foreach (DictionaryEntry dEntry in HttpContext.Current.Cache)
                   {
                       HttpContext.Current.Cache.Remove(dEntry.Key.ToString());
                   }

               }
           }



       }

String sKey = Login1.UserName + Login1.Password;
                    string sUser = Convert.ToString(Cache[sKey]);

                    //no cache item
                    if (sUser == null || sUser==" ")
                    {


                        TimeSpan sesstimeout = new TimeSpan(0, 0, HttpContext.Current.Session.Timeout, 0, 0);
                        HttpContext.Current.Cache.Insert(sKey, sKey, null, DateTime.MaxValue, sesstimeout, System.Web.Caching.CacheItemPriority.NotRemovable, null);
                        Session["user"] = Login1.UserName + Login1.Password;
                    }
                    else
                    {
                        HttpContext.Current.Response.Write("User is already Login");
                    }