Use function like
public static String XHTMLDecode(String Input)
{
if (!string.IsNullOrEmpty(Input))
{
Input = HttpUtility.HtmlDecode(Input);
return Input.Replace("&", "&").Replace("&amp;", "&").Replace("<", "<").Replace(">", ">").Replace("\"", """);
}
else
{
return string.Empty;
}
}