C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Linq;

public class Program
{
	static int foo(string source, char charToCount)
	{
		return source.Count(x => x == charToCount);
	}

	public static void Main()
	{
		Console.WriteLine("Hello World");
		Console.WriteLine(foo("Hello World", 'H'));
	}
}

​x
 
using System;
using System.Linq;
​
public class Program
{
    static int foo(string source, char charToCount)
    {
        return source.Count(x => x == charToCount);
    }
​
    public static void Main()
    {
        Console.WriteLine("Hello World");
        Console.WriteLine(foo("Hello World", 'H'));
    }
}

First Hashset:
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   2
   3
Second Hashset:
   3
   5
   8
   13
First Hashset union with second Hashset:
   1
   2
   3
   5
   8
   13

Last Run:	12:09:49 pm
Compile:	0.007s
Execute:	0.05s
Memory:	2.90Mb
CPU:	0.057s

View IL Code