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copied!<p>This is by design - each key in a <code>Hashtable</code> is unique, and assigning a value to a key that already exists will overwrite that value when using the indexing operator <code>[]</code>.</p> <p>I would suggest a couple of changes:</p> <p>First, avoid using <code>Hashtable</code> altogether if possible, and instead use one of the generic collections e.g. <code>Dictionary<,></code>.</p> <p>If you do in fact need multiple values per key, you can probably use something along the following lines:</p> <pre><code>var dict = new Dictionary<string, List<string>>(); foreach (XmlNode node in xnode) { var key = node.Attributes["key"].Value; List<string> values; if (!dict.TryGetValue(key, out values)) { values = new List<string>(); dict.Add(key, values); } values.Add(node.Attributes["value"].Value); } </code></pre> <p>Or to use Linq to construct the dictionary, you can use something like:</p> <pre><code>var dict = xnode.Cast<XmlNode>() .GroupBy(n => n.Attributes["key"].Value, n => n.Attributes["value"].Value) .ToDictionary(g => g.Key, g => g.ToList()); </code></pre> <p>If you absolutely have to use <code>Hashtable</code> then the above can be adapted as follows:</p> <pre><code>var hash = new Hashtable(); foreach (XmlNode node in xnode) { var key = node.Attributes["key"].Value; var values = (List<string>)hash[key]; if (values == null) { values = new List<string>(); hash.Add(key, values); } values.Add(node.Attributes["value"].Value); } </code></pre>

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