How to Concatenate Two Lists in C# - Step by Step Examples

How to Concatenate Two Lists in C# ?

Answer

To concatenate two lists in C#, you can use the AddRange method of the List class.


✐ Examples

1 Concatenate Lists Using AddRange Method

In this example,

  1. We create two lists: list1 and list2 with initial values.
  2. We use the AddRange method to append all elements of list2 to list1.
  3. Finally, we print the concatenated list to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3 };
        List<int> list2 = new List<int> { 4, 5, 6 };
        list1.AddRange(list2);
        Console.WriteLine("Concatenated list: " + string.Join(", ", list1));
    }
}

Output

Concatenated list: 1, 2, 3, 4, 5, 6

2 Concatenate Lists Using List Concatenation

In this example,

  1. We create two lists: list1 and list2 with initial values.
  2. We use the addition operator (+) to concatenate list2 to list1.
  3. Finally, we print the concatenated list to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3 };
        List<int> list2 = new List<int> { 4, 5, 6 };
        list1.AddRange(list2);
        Console.WriteLine("Concatenated list: " + string.Join(", ", list1));
    }
}

Output

Concatenated list: 1, 2, 3, 4, 5, 6

Summary

In this tutorial, we learned How to Concatenate Two Lists in C# language with well detailed examples.


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