URL Slugify algorithm in C#?

Here you find a way to generate url slug in c#. This function remove all accents(Marcel's answer), replace spaces, remove invalid chars, trim dashes from end and replace double occurences of "-" or "_"

Code:

public static string ToUrlSlug(string value){

        //First to lower case
        value = value.ToLowerInvariant();

        //Remove all accents
        var bytes = Encoding.GetEncoding("Cyrillic").GetBytes(value);
        value = Encoding.ASCII.GetString(bytes);

        //Replace spaces
        value = Regex.Replace(value, @"\s", "-", RegexOptions.Compiled);

        //Remove invalid chars
        value = Regex.Replace(value, @"[^a-z0-9\s-_]", "",RegexOptions.Compiled);

        //Trim dashes from end
        value = value.Trim('-', '_');

        //Replace double occurences of - or _
        value = Regex.Replace(value, @"([-_]){2,}", "$1", RegexOptions.Compiled);

        return value ;
    }

http://predicatet.blogspot.com/2009/04/improved-c-slug-generator-or-how-to.html

public static string GenerateSlug(this string phrase) 
{ 
    string str = phrase.RemoveAccent().ToLower(); 
    // invalid chars           
    str = Regex.Replace(str, @"[^a-z0-9\s-]", ""); 
    // convert multiple spaces into one space   
    str = Regex.Replace(str, @"\s+", " ").Trim(); 
    // cut and trim 
    str = str.Substring(0, str.Length <= 45 ? str.Length : 45).Trim();   
    str = Regex.Replace(str, @"\s", "-"); // hyphens   
    return str; 
} 

public static string RemoveAccent(this string txt) 
{ 
    byte[] bytes = System.Text.Encoding.GetEncoding("Cyrillic").GetBytes(txt); 
    return System.Text.Encoding.ASCII.GetString(bytes); 
}