C# Programming Language: How To Add a Collection Into a List

Hi everyone, welcome back. In this example, we will be going over how to add a collection into a list in C#. Lists can be used to store a collection of data, similar to that of an array. The difference being that the lists provide more functionality compared to that of an array, which leaves it as a great option when wanting to modify a collection of data. With this introduction out of the way, let’s get into it.

Creating And Populating List

Let’s start by creating a list. Before we can create the list, we need to make sure that we have our list import, which is included within the System.Collections.Generic package:

using System.Collections.Generic;

Now, we can create and populate our list:

List<string> myList = new List<string>()
{
    "One",
    "Two",
    "Three"
};

We have now successfully created and populated our list.

Adding a Collection Into The List

Now, let’s try to add a collection of data into our list. We can do this by using the built in AddRange() function that is provided. We will create a separate collection and attempt to add it into our list. Let’s see an example: