using System;

using System.Net;

public class Program

{

    public static void Main()

    {

        var apostrophrTest = "Pat O'Harra";

        var ampTest = "Pmpat & O'Harra";

        var quoteTest = "Pmpat \"Mike\" O'Harra";

        var helloWorldTest = "<b>Hello 'friend'</b>";

        var unicodeTest = @"ș Ș ț Ț Ă ă Î î";

        var unicodeTest2 = "ș Ș ț Ț Ă ă Î î";

        Console.WriteLine("apostrophrTest (" + apostrophrTest + "): " + HtmlEncode(apostrophrTest));

        Console.WriteLine("ampTest (" + ampTest + "): " + HtmlEncode(ampTest));

        Console.WriteLine("quoteTest (" + quoteTest + "): " + HtmlEncode(quoteTest));

        Console.WriteLine("helloWorldTest (" + helloWorldTest + "): " + HtmlEncode(helloWorldTest));

        Console.WriteLine(" ");

        var unicodeTestEncoded = HtmlEncode(unicodeTest);

        var unicodeTestEncoded2 = HtmlEncode(unicodeTest2);

        Console.WriteLine("unicodeTest (" + unicodeTest + "): " + unicodeTestEncoded);

        Console.WriteLine("unicodeTest2 (" + unicodeTest2 + "): " + unicodeTestEncoded2);

        Console.WriteLine(" ");

        Console.WriteLine("unicodeTest Decode (" + unicodeTest + "): " + HtmlDecode(unicodeTestEncoded));

        Console.WriteLine("unicodeTest2 Decode (" + unicodeTest2 + "): " + HtmlDecode(unicodeTestEncoded2));

    }

    public static string HtmlEncode(string value)

    {

        return WebUtility.HtmlEncode(value);

    }

    public static string HtmlDecode(string value)

    {

        return WebUtility.HtmlDecode(value);

    }

}