[Concept Entry] C#: Lists (#7521)

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Author: eduuHT

content/c-sharp/concepts/lists/lists.md

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+---
+Title: 'Lists'
+Description: 'A List in C# is a dynamic data structure that stores multiple objects of a specified type.'
+Subjects:
+  - 'Computer Science'
+  - 'Code Foundations'
+  - 'Developer Tools'
+Tags:
+  - 'Data Structures'
+  - 'Lists'
+CatalogContent:
+  - 'learn-c-sharp'
+  - 'paths/computer-science'
+---
+
+A **`List`** in [C#](https://www.codecademy.com/resources/docs/c-sharp) is a dynamic [data structure](https://www.codecademy.com/resources/docs/general/data-structures) that stores multiple objects of a specified type. These objects can be accessed by their zero-based index. Unlike [arrays](https://www.codecademy.com/resources/docs/c-sharp/arrays). Lists can grow to accommodate a very large number of elements (up to about 2 billion), limited primarily by available system memory and the maximum value of an integer index."
+
+## Syntax
+
+> **Note:** Before creating a list, include the `System.Collections.Generic` namespace.
+
+There are two common ways to create a `List` in C#:
+
+```pseudo
+// Creating a List without any elements
+List<T> myList = new List<T>();
+```
+
+Or alternatively:
+
+```pseudo
+// Creating a List with three elements
+List<T> myList = new List<T> { element1, element2, element3 };
+```
+
+**Parameters:**
+
+- `T`: Represents any data type.
+- `element`: Any object or variable of type `T`.
+
+## Example: Creating and Accessing a List
+
+In this example, a list is created, numbers are added, and elements are accessed by their index:
+
+```cs
+using System;
+using System.Collections.Generic;
+
+class Program
+{
+  static void Main()
+  {
+    // Create a list of integers
+    List<int> numbers = new List<int>();
+
+    // Add elements to the list
+    numbers.Add(10);
+    numbers.Add(20);
+    numbers.Add(30);
+
+    // Access elements by index
+    Console.WriteLine(numbers[0]);
+    Console.WriteLine(numbers[1]);
+    Console.WriteLine(numbers[2]);
+  }
+}
+```
+
+The output of this code is:
+
+```shell
+10
+20
+30
+```
+
+## Codebyte Example: Printing elements in a List
+
+This example creates a new `List` that stores three numbers. Since each element has an index, we can print each element in the `numbers` list by its index:
+
+```codebyte/csharp
+using System;
+using System.Collections.Generic;
+
+public class Test
+{
+  public static void Main()
+  {
+    List<int> numbers = new List<int> { 2, 5, 10 };
+
+    Console.WriteLine(numbers[0]);
+    Console.WriteLine(numbers[1]);
+    Console.WriteLine(numbers[2]);
+  }
+}
+```