C# / .NET - combine multiple lists

In this article, we would like to show you how to combine multiple lists in C#.

Quick solution:

List<string> list1 = new List<string> { "A", "B" };
List<string> list2 = new List<string> { "C", "D" };
List<string> list3 = new List<string> { "E", "F" };

List<string> combinedList = list1.Concat(list2).Concat(list3).ToList();

Practical example

In this example, we use Concat() method from System.Linq to combine multiple lists into one.

using System;
using System.Linq;
using System.Collections.Generic;

public static class Program
{
    public static void Main(string[] args)
    {
        List<string> list1 = new List<string> { "A", "B" };
        List<string> list2 = new List<string> { "C", "D" };
        List<string> list3 = new List<string> { "E", "F" };

        List<string> combinedList = list1.Concat(list2).Concat(list3).ToList();

        foreach (string items in combinedList)
            Console.WriteLine(items);
    }
}

Output:

A
B
C
D
E
F

References

1. Enumerable.Concat<TSource>() Method (System.Linq) | Microsoft Docs