sion value for a session-key that must exist.
   /// If the key does not exist an applicationException is thrown.
   /// </summary>
   /// <param name="eKey"> The session-key to return the session-value for. </param>
   /// <returns> A none-null value.</returns>
   private static object GetMandatoryValue( eKeys eKey )
   {
   //get the value
   object oValue = GetValue( eKey );
  
   //key not found or value null?
   if ( null == oValue )
   {
   //throw applicationException because its application logic error (none CLR)
   throw new ApplicationException ( String.Format( sMANDATORY_SESSION_KEY_NOT_FOUND_MSG, eKey.ToString() ));
   }
  
   //everything oke: return value
   return oValue;
   }
   #endregion
   private: GetValue( eKeys eKey )#region private: GetValue( eKeys eKey )
   /**//// <summary>
   /// Gets the session value from the specified key.
   /// </summary>
   /// <param name="eKey">The key to get the value from</param>
   /// <returns>The session value for the specified session key.
   /// If the key does not exist, null is returned.
   /// </returns>
   private static object GetValue( eKeys eKey )
   {
   return HttpCo

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