C# interweave two uneven List into a new List

Question

I have two List, both of different lengths. What I am trying to achieve is a third List that contains the first element from list1, then the first element from list2, then s

Answer 1

int length = Math.Min(list1.Count, list2.Count);

// Combine the first 'length' elements from both lists into pairs
list1.Take(length)
.Zip(list2.Take(length), (a, b) => new int[] { a, b })
// Flatten out the pairs
.SelectMany(array => array)
// Concatenate the remaining elements in the lists)
.Concat(list1.Skip(length))
.Concat(list2.Skip(length));