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POSorting data from XML file with C# : Not Sorting
 

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    <p>I'm trying to sort items before they're put into the combobox. Heres the code I'm using</p> <pre><code>public void InitializeDropDown(string XmlFile, string xpath) { XmlDocument doc = new XmlDocument(); doc.Load(XmlFile); XPathNavigator navigator = doc.CreateNavigator(); XPathExpression expression = navigator.Compile(xpath); expression.AddSort("name", XmlSortOrder.Descending, XmlCaseOrder.UpperFirst, string.Empty, XmlDataType.Text); XPathNodeIterator iterator = navigator.Select(expression); foreach (XPathNavigator item in iterator) { WeatherServicesCBO.Items.Add(item.Value); } } </code></pre> <p>I thought this would be the correct way to sort XML data, what am I missing?</p> <p><strong>EDIT</strong>: Here are some other techniques I've tried thus far either doesn't sort of I get an error. </p> <p>First try (no sorting)</p> <pre><code>public void InitializeDropDown(string XmlFile, string xpath) { var doc = new XmlDocument(); doc.Load(XmlFile); XPathNavigator navigator = doc.CreateNavigator(); XPathExpression expression = navigator.Compile(xpath); expression.AddSort("@name", XmlSortOrder.Descending, XmlCaseOrder.UpperFirst, string.Empty, XmlDataType.Text); XPathNodeIterator iterator = navigator.Select(expression); foreach (XPathNavigator item in iterator) { WeatherServicesCBO.Items.Add(item.Value); } } </code></pre> <p>Second attempt (gives error <strong>The non-generic type 'System.Collections.IEnumerable' cannot be used with type arguments</strong>)</p> <pre><code>public void InitializeDropDown(string XmlFile, string xpath) { string[] services = { "Google Weather", "Yahoo! Weather", "NOAA", "WeatherBug" }; IEnumerable&lt;string&gt; query = from service in services orderby service.Substring(0, 1) ascending select service; foreach (string @string in query) WeatherServicesCBO.Items.Add(@string); } </code></pre> <p>Third attempt (get a NullReferenceException)</p> <pre><code>public void InitializeDropDown(string XmlFile, string xpath) { var doc = XDocument.Load(XmlFile); foreach (var item in doc.XPathSelectElements(xpath).OrderByDescending(n =&gt; n.Attribute("name").Value)) WeatherServicesCBO.Items.Add(item); } </code></pre>
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