Turn any string into a hashtag in c#

HashtagUtil.cs

//Input: "St. Patrick's Day: Awësöme tö-dö's"
//Output: "#StPatricksDayAwesomeToDos"
public static string MakeHashtag(string text)
{
    text = RemoveDiacritics(CultureInfo.CurrentCulture.TextInfo.ToTitleCase(text));
    text = Regex.Replace(text, @"[^a-zA-Z0-9]", "");
    
    return "#" + text;
}

/// See: http://www.siao2.com/2007/05/14/2629747.aspx
private static string RemoveDiacritics(string stIn)
{
    string stFormD = stIn.Normalize(NormalizationForm.FormD);
    StringBuilder sb = new StringBuilder();
    
    for (int ich = 0; ich < stFormD.Length; ich++)
    {
        System.Globalization.UnicodeCategory uc = System.Globalization.CharUnicodeInfo.GetUnicodeCategory(stFormD[ich]);
        if (uc != System.Globalization.UnicodeCategory.NonSpacingMark)
        {
        	sb.Append(stFormD[ich]);
        }
    }

	return (sb.ToString().Normalize(NormalizationForm.FormC));
}