PLainText HTML, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Text.RegularExpressions;
using System.Text;

namespace Rextester
{
   public class Program
{
	public static void Main(string[] args)
	{
        var PlainText= HTMLToText("<p>Some text here</p><div> Some more <strong>text</strong></div>");
		Console.WriteLine(PlainText);
	}
	
	 public static string HTMLToText(string HTMLCode)
        {
            // Remove new lines since they are not visible in HTML
            HTMLCode = HTMLCode.Replace("\n", " ");

// Remove tab spaces
            HTMLCode = HTMLCode.Replace("\t", " ");

// Remove multiple white spaces from HTML
            HTMLCode = Regex.Replace(HTMLCode, "\\s+", " ");

// Remove HEAD tag
            HTMLCode = Regex.Replace(HTMLCode, "<head.*?</head>", ""
                                , RegexOptions.IgnoreCase | RegexOptions.Singleline);

// Remove any JavaScript
            HTMLCode = Regex.Replace(HTMLCode, "<script.*?</script>", ""
              , RegexOptions.IgnoreCase | RegexOptions.Singleline);

// Replace special characters like &, <, >, " etc.
            StringBuilder sbHTML = new StringBuilder(HTMLCode);
            // Note: There are many more special characters, these are just
            // most common. You can add new characters in this arrays if needed
            string[] OldWords = {"&nbsp;", "&amp;", "&quot;", "&lt;", "&gt;", "&reg;", "&copy;", "&bull;", "&trade;"};
		 
            string[] NewWords = { " ", "&", "\"", "<", ">", "Â®", "Â©", "â€¢", "â„¢" };
            for (int i = 0; i < OldWords.Length; i++)
            {
                sbHTML.Replace(OldWords[i], NewWords[i]);
            }

// Check if there are line breaks (<br>) or paragraph (<p>)
            sbHTML.Replace("<br>", "\n<br>");
            sbHTML.Replace("<br ", "\n<br ");
            sbHTML.Replace("<p ", "\n<p ");

// Finally, remove all HTML tags and return plain text
            return System.Text.RegularExpressions.Regex.Replace(
              sbHTML.ToString(), "<[^>]*>", "");
        }
}
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,19 sec, cpu time: 0,17 sec, average memory usage: 20 Mb, average nr of threads: 4