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    <p>Despite the fact that the <code>app.config</code> file can be written to (using <a href="http://msdn.microsoft.com/en-us/library/ms224437.aspx" rel="nofollow noreferrer"><code>ConfigurationManager.OpenExeConfiguration</code></a> to open for writing), the usual practice is to store read-only settings in there.</p> <p>It's easy to write a simple settings class:</p> <pre><code>public sealed class Settings { private readonly string _filename; private readonly XmlDocument _doc = new XmlDocument(); private const string emptyFile = @"&lt;?xml version=""1.0"" encoding=""utf-8"" ?&gt; &lt;configuration&gt; &lt;appSettings&gt; &lt;add key=""defaultkey"" value=""123"" /&gt; &lt;add key=""anotherkey"" value=""abc"" /&gt; &lt;/appSettings&gt; &lt;/configuration&gt;"; public Settings(string path, string filename) { // strip any trailing backslashes... while (path.Length &gt; 0 &amp;&amp; path.EndsWith("\\")) { path = path.Remove(path.Length - 1, 1); } _filename = Path.Combine(path, filename); if (!Directory.Exists(path)) { Directory.CreateDirectory(path); } if (!File.Exists(_filename)) { // Create it... _doc.LoadXml(emptyFile); _doc.Save(_filename); } else { _doc.Load(_filename); } } /// &lt;summary&gt; /// Retrieve a value by name. /// Returns the supplied DefaultValue if not found. /// &lt;/summary&gt; public string Get(string key, string defaultValue) { XmlNode node = _doc.SelectSingleNode("configuration/appSettings/add[@key='" + key + "']"); if (node == null) { return defaultValue; } return node.Attributes["value"].Value ?? defaultValue; } /// &lt;summary&gt; /// Write a config value by key /// &lt;/summary&gt; public void Set(string key, string value) { XmlNode node = _doc.SelectSingleNode("configuration/appSettings/add[@key='" + key + "']"); if (node != null) { node.Attributes["value"].Value = value; _doc.Save(_filename); } } } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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