Merging 2 Lists

Question

For example I have these two lists:

List<string> firstName = new List<string>();
List<string> lastName = new List<string>();

How can I concatenate firstName[0] and lastName[0], firstName[1] and lastName[1], etc and put it in a new list?

Answer 1

It sounds like you want Zip from LINQ:

var names = firstName.Zip(lastName, (first, last) => first + " " + last)
                     .ToList();

(This isn't really concatenating the two lists. It's combining them element-wise, but that's not really the same thing.)

EDIT: If you're using .NET 3.5, you can include the Zip method yourself - Eric Lippert's blog post on it has sample code.