C# variable or array with number range (example. 1 - 100)

Question

I'm fairly new to C# and I'm doing a school project, i need to figure out how to get a variable or an array with numbers from 1 to 100 without entering every single number in an array for example int[] numbersArray {1,2,3,4,5,6,7,8,9,10...}; because that takes a long time and doesn't look very efficient.

I'm using C# Visual Studio Express 2010. It would mean alot to me if you could answer this for me. I'm gonna be using it in an if statement like so:

if(numbersArray.Contains(numbersInput))
{
    Console.WriteLine("numbersInput was a number from 1 to 100")
}

Answer 1

You can use Enumerable.Range to create a range of numbers:

int[] arr = Enumerable.Range(1, 100).ToArray();

Answer 2

If you're assignment is just to print a message if the input is within a range you simply can do this:

if (numbersInput >= 1 && numbersInput <= 100)
    Console.WriteLine("numbersInput was a number from 1 to 100");

But if you really need to create an array with numbers 1..100 you can use a for-loop:

var numbersArray = new int[100];
for (var i = 1; i <= 100; i++)
    numbersArray[i - 1] = i;

Or simply use a little Linq:

var numbersArray = Enumerable.Range(1, 100).ToArray();