Extract Updateversion code from MainWindow

Client/CheckUpdate.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Threading;
+using System.Xml;
+using ToDoLib;
+using System.Windows;
+
+namespace Client
+{
+    class CheckUpdate
+    {
+        public const string updateXMLUrl = @"https://raw.github.com/benrhughes/todotxt.net/master/Updates.xml";
+        public const string updateClientUrl = @"https://github.com/benrhughes/todotxt.net/downloads";
+
+        public delegate void CheckUpdateVershion(string version);
+        public event CheckUpdateVershion OnCheckedUpdateVershion;
+
+        private XmlDocument xDoc;
+
+        public CheckUpdate()
+        {
+            xDoc = new XmlDocument();
+        }
+
+        public void Check()
+        {
+            ThreadPool.QueueUserWorkItem(x => CheckForUpdates());
+        }
+
+        private void CheckForUpdates()
+        {
+            try
+            {
+                xDoc.Load(new XmlTextReader(updateXMLUrl));
+
+                var version = xDoc.SelectSingleNode("//version").InnerText;
+                var changelog = xDoc.SelectSingleNode("//changelog").InnerText;
+                OnCheckedUpdateVershion(version);
+            }
+            catch (Exception ex)
+            {
+                Log.Error("Error checking for updates", ex);
+            }
+        }
+    }
+}

Client/Client.csproj

@@ -78,6 +78,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="CheckUpdate.cs" />
     <Compile Include="FilterDialog.xaml.cs">
       <DependentUpon>FilterDialog.xaml</DependentUpon>
     </Compile>

Client/MainWindow.xaml.cs

@@ -56,6 +56,7 @@ enum SortType
         TrayMainWindows _tray;
         HotKeyMainWindows _hotkey;
         ObserverChangeFile _changefile;
+        CheckUpdate _checkupdate;
 
 		WindowLocation _previousWindowLocaiton;
 
@@ -75,6 +76,11 @@ public MainWindow()
                 _changefile = new ObserverChangeFile();
                 _changefile.OnFileTaskListChange += () => Dispatcher.Invoke(DispatcherPriority.Normal, new Action(delegate() { this.Refresh(); }));
 
+                //CheckUpdate new version
+                _checkupdate = new CheckUpdate();
+                _checkupdate.OnCheckedUpdateVershion += (string version) => Dispatcher.BeginInvoke(new CheckUpdate.CheckUpdateVershion(this.ShowUpdateMenu), version);
+                _checkupdate.Check();
+
 				webBrowser1.Navigate("about:blank");
 
 				// migrate the user settings from the previous version, if necessary
@@ -103,29 +109,12 @@ public MainWindow()
 				Log.Error(msg, ex);
 				MessageBox.Show(ex.Message, msg, MessageBoxButton.OK);
 			}
-
-			ThreadPool.QueueUserWorkItem(x => CheckForUpdates());
+
 		}
 
 		#region private methods
 
-		private void HideUnHideWindow()
-        {
-            if (this.WindowState == WindowState.Minimized)
-            {
-                this.Show();
-                this.Topmost = true;
-                this.Activate();
-                this.WindowState = WindowState.Normal;
-            }
-            else
-            {
-                this.WindowState = WindowState.Minimized;
-                this.Hide();
-            }
-        }
-
-       private void Reload()
+        private void Reload()
 		{
 			try
 			{
@@ -417,37 +406,14 @@ private void FilterAndSort(SortType sort)
 			}
 		}
 
-		private void CheckForUpdates()
-		{
-			const string updateXMLUrl = @"https://raw.github.com/benrhughes/todotxt.net/master/Updates.xml";
-
-			var xDoc = new XmlDocument();
-
-			try
-			{
-				xDoc.Load(new XmlTextReader(updateXMLUrl));
-
-				var version = xDoc.SelectSingleNode("//version").InnerText;
-				var changelog = xDoc.SelectSingleNode("//changelog").InnerText;
-
-				var assemblyVersion = Assembly.GetExecutingAssembly().GetName().Version.ToString();
-
-				if (version != assemblyVersion)
-				{
-					Dispatcher.Invoke(new Action<string>(ShowUpdateMenu), version);
-				}
-			}
-			catch (Exception ex)
-			{
-				Log.Error("Error checking for updates", ex);
-			}
-
-		}
-
 		private void ShowUpdateMenu(string version)
 		{
-			this.UpdateMenu.Header = "New version: " + version;
-			this.UpdateMenu.Visibility = Visibility.Visible;
+            var assemblyVersion = Assembly.GetExecutingAssembly().GetName().Version.ToString();
+            if (version != assemblyVersion)
+            {
+                this.UpdateMenu.Header = "New version: " + version;
+                this.UpdateMenu.Visibility = Visibility.Visible;
+            }
 		}
 		#endregion
 
@@ -749,7 +715,7 @@ private void Sort_Alphabetical(object sender, RoutedEventArgs e)
 		#region Update notification
 		private void Get_Update(object sender, RoutedEventArgs e)
 		{
-			Process.Start("https://github.com/benrhughes/todotxt.net/downloads");
+			Process.Start(CheckUpdate.updateClientUrl);
 		}
 		#endregion