XML C#

using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Xml;
using System.Xml.Linq;
public static class XmlUtility
{
    public static DateTime? GetValueAsDateTime(this XElement element, IFormatProvider formatProvider)
    {
        Debug.Assert(formatProvider != null, "formatProvider is null.");
        if (String.IsNullOrEmpty(element.Value) == false)
        {
            DateTime dateTime;
            if (DateTime.TryParse(element.Value, formatProvider, DateTimeStyles.None, out dateTime))
            {
                return dateTime;
            }
        }
        return null;
    }
    public static DateTime? GetValueAsDateTime(this XAttribute attribute, IFormatProvider formatProvider)
    {
        if (String.IsNullOrEmpty(attribute.Value) == false)
        {
            DateTime dateTime;
            if (DateTime.TryParse(attribute.Value, formatProvider, DateTimeStyles.None, out dateTime))
            {
                return dateTime;
            }
        }
        return null;
    }
}