Microsoft.Samples.KMoore.WPFSamples.DateControls.MonthCalendar.GetKeyFromDataSourceItem C# (CSharp) Method

        private DateTime? GetKeyFromDataSourceItem(object value)
        {
            if (_dummyItem == null)
            {
                _dummyItem = new FrameworkElement();
            }

            Binding bind = new Binding();
            if (DataSourceDatePath != null)//TODO:bug#1662127
            {
                bind.Path = DataSourceDatePath;
            }
            bind.XPath = DataSourceDateXPath;
            bind.Source = value;
            _dummyItem.SetBinding(FrameworkElement.TagProperty, bind);

            object tag = _dummyItem.Tag;
            if (_dummyItem.Tag is XmlAttribute)
            {
                tag = ((XmlAttribute)_dummyItem.Tag).Value;
            }
            else if (_dummyItem.Tag is XmlElement)
            {
                tag = ((XmlElement)_dummyItem.Tag).InnerText;
            }

            DateTime? key = new DateTime?();
            if (tag is string)
            {
                try
                {
                    key = DateTime.Parse((string)tag, Language.GetSpecificCulture().DateTimeFormat);
                }
                catch (FormatException)
                {
                }
            }
            else if (tag is DateTime)
            {
                key = (DateTime)_dummyItem.Tag;
            }

            BindingOperations.ClearBinding(_dummyItem, FrameworkElement.TagProperty);

            return key;
        }