public static IObjectMergerLogger GetInstance()
 {
     if (_instance == null)
     {
         _instance = new ObjectMergerLogger();
     }
     return(_instance);
 }
 /// <summary>
 ///
 /// </summary>
 /// <param name="logger">if null, the instance will be the default logger</param>
 public static void SetInstance(IObjectMergerLogger logger)
 {
     if (logger == null)
     {
         _instance = new ObjectMergerLogger();
     }
     else
     {
         _instance = logger;
     }
 }