Array

Question

How to create an array with an indefinite number of variables in C#?

Answer 1

You cannot.

You need to define the size of an array upon declaration.
That the nature of a array.
https://www.tutorialspoint.com/csharp/csharp_arrays.htm

If you need to have list without a predefined size use a "list".
https://csharp-station.com/Tutorial/CSharp/Lesson20

Answer 2

Simple, you create a list!

using System.Collections.*;

List<datatype> indefinite = new List<datatype>();

indefinite.Add("test");
indefinite.Add("test2");

Replace <datatype> with the datatype of your choice!

You can than remove, reverse, sort and use useful methods such as contains, ToArray, Exists etc