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    copied!<p>For completeness.. I ended up with this hack. Ugly, but it works.</p> <p>In Main method<br> // Only do upgrade check if we have no settings if (string.IsNullOrEmpty(Properties.Settings.Default.Categories)) { UpgradeAppSettings(); }</p> <p>With these methods in the same class.</p> <pre><code> private static void UpgradeAppSettings() { try // Fail silently! This hack is not important enough to cause problems { List&lt;string&gt; paths = new List&lt;string&gt;(); paths.Add(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)); paths.Add(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)); foreach (string path in paths) { string companypath = System.IO.Directory.GetDirectories(path, "COMPANYNAME").FirstOrDefault(); if (companypath != null) { string appfolder = System.IO.Directory.GetDirectories(companypath, "OldName.exe_*").FirstOrDefault(); if (appfolder != null) { // Get the highest version of the app that contains a user.config file var version = System.IO.Directory.GetDirectories(appfolder) .Select( d =&gt; new { Path = d, Version = CreateVersion(new System.IO.DirectoryInfo(d).Name), ConfigFile = System.IO.Directory.GetFiles(d, "user.config").FirstOrDefault() } ) .Where(v =&gt; v.Version != null &amp;&amp; v.ConfigFile != null) .OrderByDescending(v =&gt; v.Version) .FirstOrDefault(); if (version != null) { string text = System.IO.File.ReadAllText(version.ConfigFile); // Change the namespace for serialized categories text = text.Replace( "http://schemas.microsoft.com/clr/nsassem/OldName/OldName", "http://schemas.microsoft.com/clr/nsassem/OldName/NewName"); var doc = XDocument.Parse(text); var settings = doc.Descendants("setting"); // These are the settings we are interested in ApplySetting(settings, "Categories", s =&gt; Properties.Settings.Default.Categories = s); ApplySetting(settings, "ActiveCategoryFilter", s =&gt; Properties.Settings.Default.ActiveCategoryFilter = s); ApplySetting(settings, "ActiveCategoryFilterDisplayName", s =&gt; Properties.Settings.Default.ActiveCategoryFilterDisplayName = s); ApplySetting(settings, "ListViewLayout", s =&gt; Properties.Settings.Default.ListViewLayout = s); ApplySetting(settings, "SplitterSizes", s =&gt; Properties.Settings.Default.SplitterSizes = s); ApplySetting(settings, "EditorSizes", s =&gt; Properties.Settings.Default.EditorSizes = s); ApplySetting(settings, "WindowStates", s =&gt; Properties.Settings.Default.WindowStates = s); ApplySetting(settings, "WindowStates", s =&gt; Properties.Settings.Default.WindowStates = s); break; } } } } } catch { } } private static void ApplySetting(IEnumerable&lt;XElement&gt; settings, string name, Action&lt;string&gt; action) { var cat = settings.FirstOrDefault(s =&gt; s.Attribute("name") != null &amp;&amp; s.Attribute("name").Value == name); if (cat != null) { action(cat.Value); } } </code></pre>
 

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