how to use Yield Keyword in C# or Asp.net C#?

How to use Yield Keyword in C#:

The yield keyword is used to define a function which returns an IEnumerable or 

IEnumerator (as well as their derived generic variants) whose values are generated

 lazily as a caller iterates over the returned collection. Read more about the purpose in 

the remarks section.

The following example has a yield return statement that's inside a for loop.

public static IEnumerable<int> Count(int start, int count)
{
    for (int i = 0; i <= count; i++)
    {
        yield return start + i;
    }
}

Then you can call it:

foreach (int value in Count(start: 4, count: 10))
{
    Console.WriteLine(value);
}