public IAndFilter <IBuilder> And(string comparing, ITextualCondition toCondition)
 {
     _comparingTo.Add(new Tuple <string, ITextualCondition>(
                          comparing, toCondition
                          ));
     return(this);
 }
 IAndFilter <IBuilder> IWhereFilter <IAndFilter <IBuilder> > .Where(string comparing, ITextualCondition toCondition)
 {
     _comparingTo = new List <Tuple <string, ITextualCondition> > {
         new Tuple <string, ITextualCondition> (
             comparing, toCondition
             )
     };
     return(this);
 }