Answer Posted / wasim akhtar

The IEnumerable interface appears throughout C# programs. It specifies that the underlying type implements the GetEnumerator method. It enables the foreach-loop to be used.
Program that uses IEnumerable<T> [C#]

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
static void Main()
{
IEnumerable<int> result = from value in Enumerable.Range(0, 2)
select value;

// Loop.
foreach (int value in result)
{
Console.WriteLine(value);
}

// We can use extension methods on IEnumerable<int>
double average = result.Average();

// Extension methods can convert IEnumerable<int>
List<int> list = result.ToList();
int[] array = result.ToArray();
}
}

Output

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