c# add list into hashset

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List<string> letters = new List<string> { "A", "B", "C" };

HashSet<string> alphabet = new HashSet<string>(letters);

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using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        List<string> letters = new List<string> { "A", "B", "C" };

        HashSet<string> alphabet = new HashSet<string>(letters);

        foreach (string letter in alphabet)
            Console.WriteLine(letter);
    }
}

// Output:
// A
// B
// C

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using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        List<string> letters = new List<string> { "A", "B", "C" };

        HashSet<string> alphabet = new HashSet<string>();

        alphabet.UnionWith(letters);

        foreach (string letter in alphabet)
            Console.WriteLine(letter);
    }
}

// Output:
// A
// B
// C