var myswitch = new Dictionary <Func<int,bool>, Action>
            {
             { x => x < 10 ,    () => //Do this!...  },
             { x => x < 100 ,    () => //Do this!...  },
             { x => x < 1000 ,    () => //Do this!...  },
             { x => x < 10000 ,   () => //Do this!... } ,
             { x => x < 100000 ,  () => //Do this!... },
             { x => x < 1000000 ,  () => //Do this!... }
            };

  myswitch.First(sw => sw.Key(mynumbercheck)).Value();