# Join two lists of different length

• A+
Category：Languages

I am using LINQ:

``List<String> listA = new List<string>{"a", "b", "c", "d", "e", "f", "g"};   List<String> listB = new List<string>{"1", "2", "3"};   ``

Desired result:

``{"a", "1", "b", "2", "c", "3", "d", "1", "e", "2", "f", "3", "g", "1"}   ``

I tried but fail:

``var mix = ListA.Zip(ListB, (l1, l2) => new[] { l1, l2 }).SelectMany(x => x);   //Result : {"a", "1", "b", "2", "c", "3"}    var mix = ListA.Zip(ListB, (a, b) => new[] { a, b })         .SelectMany(x => x)         .Concat(ListA.Count() < ListB.Count() ? ListB.Skip(ListA.Count()) : ListA.Skip(ListB.Count()))         .ToList();   //Result : {"a", "1", "b", "2", "c", "3", "d", "e", "f", "g"}   ``

How can I do this using LINQ?

This works, even if I am not sure why you need it as linq expression:

``var mix = Enumerable            .Range(0, Math.Max(listA.Count, listB.Count))            .Select(i => new[] { listA[i % listA.Count], listB[i % listB.Count] })            .SelectMany(x => x); ``