C# string[] vs List<string>: Which Should You Use?

Use an array when the size is fixed and known up front. Use a List<string> when you need to add or remove elements dynamically.

Quick comparison

Type	Best for	Size	Common methods
`string[]`	Fixed-size data, simple containers	Fixed	`Length`, indexing
`List<string>`	Dynamic collections, growing input	Flexible	`Add`, `Remove`, `Contains`, `Count`

C# Example Code

string[] names = { "Alice", "Bob", "Carol" };
Console.WriteLine(names[0]);

C# Example Code

var names = new List<string> { "Alice", "Bob" };
names.Add("Carol");
Console.WriteLine(names.Count);

C# Example Code

string[] array = { "one", "two", "three" };
List<string> list = array.ToList();

string[] fromList = list.ToArray();

Arrays are slightly lighter and simpler for fixed-size data. Lists are more convenient for changing collections.

Prefer List<string> when the number of items is unknown or grows while the program runs.

Take It Further

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