Pangram algorithms in C#

pangram.cs

// See https://aka.ms/new-console-template for more information

var input = "THE quick BROWN foX Jumps over the lazy cat";
var isPangram = Pangram.IsPangram(input);
Console.WriteLine(isPangram ? "Yes!" : "No");

public class Pangram {
    const string alphabet = "abcdefghijklmnopqrstuvwxyz";
    public static bool IsPangram(string text) {
        text = text.ToLower();
        var result = alphabet.All(letter => {
            Console.WriteLine($"Checking whether text contains '{letter}...");
            var textContainsLetter = text.Contains(letter);
            if (textContainsLetter) {
                Console.WriteLine("Yes, it does! Checking the next letter...");
            } else {
                Console.WriteLine($"No, the letter '{letter}' is NOT in the text, so this is not a pangram.");
            }
            return textContainsLetter;
        });
        return result;
    }
}

public class PangramVersion2 {
    const string alphabet = "abcdefghijklmnopqrstuvwxyz";
    public static bool IsPangram(string text) {
        text = text.ToLower();
        var result = alphabet.All(letter => text.Contains(letter));
        return result;
    }
}

public class PangramVersion3 {

    const string alphabet = "abcdefghijklmnopqrstuvwxyz";
    public static bool IsPangram(string text) {
        text = text.ToLower();
        return alphabet.All(text.Contains);
    }
}

Thanks.