CSharp - What is the output: Array Bounds?

Question

What is the output of the following code?

using System;
class MainClass
{
   public static void Main(string[] args)
   {
        int[] arr = new int[3];
        arr[3] = 1;               // IndexOutOfRangeException thrown

        Console.WriteLine(arr[3]);

   }
}

arr[3] = 1;               // IndexOutOfRangeException thrown

Note

All array indexing is bounds-checked by the runtime.

An IndexOutOfRangeException is thrown if you use an invalid index:

In the following code

int[] arr = new int[3];

defines an array with 3 element and the array index is started at 0. Therefore the array element are arr[0], arr[1], arr[2].

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