list<t> has .count property, t<> arrays .length instead. presume because arrays fixed-length whereas others aren't, difference in syntax can still frustrating. if refactor array list, therefore gives "does not contain definition .length" errors, , seems waste of time having change when .count , .length same. is there way deal ? possible extend list<t> add .length property that's alias .count instance, , vice-versa generic array ? , bad idea reason ? you can use count method provided linq. this optimised use count property provided icollection<t> interface possible (or non-generic icollection interface in .net 4). arrays, list<t> etc optimised. var yourlist = new list<string> { "the", "quick", "brown", "fox" }; int count1 = yourlist.count(); // uses icollection<t>.count property var yourarray = new[] { 1, 2, 4, 8, 16, 32, 64, 128 }; int count2 = youra...