Added SQLite demo, mods to ToDo

New simple SQLite demo.
Also updated TODOFileHandlingSample, TODOFilePickerSample and TODOPivot
so that you can add a new ToDo item with touch

SQLiteDemo/SQLiteDemo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.22823.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SQLiteDemo", "SQLiteDemo\SQLiteDemo.csproj", "{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|ARM = Debug|ARM
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|ARM = Release|ARM
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|ARM.ActiveCfg = Debug|ARM
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|ARM.Build.0 = Debug|ARM
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|ARM.Deploy.0 = Debug|ARM
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|x64.ActiveCfg = Debug|x64
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|x64.Build.0 = Debug|x64
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|x64.Deploy.0 = Debug|x64
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|x86.ActiveCfg = Debug|x86
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|x86.Build.0 = Debug|x86
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Debug|x86.Deploy.0 = Debug|x86
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|ARM.ActiveCfg = Release|ARM
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|ARM.Build.0 = Release|ARM
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|ARM.Deploy.0 = Release|ARM
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|x64.ActiveCfg = Release|x64
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|x64.Build.0 = Release|x64
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|x64.Deploy.0 = Release|x64
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|x86.ActiveCfg = Release|x86
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|x86.Build.0 = Release|x86
+		{9D1D1BF6-1644-4635-B00A-BFB52FD53EB9}.Release|x86.Deploy.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

SQLiteDemo/SQLiteDemo/App.xaml

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+<Application
+    x:Class="SQLiteDemo.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:SQLiteDemo"
+    xmlns:converters="using:SQLiteDemo.Converters">
+
+    <Application.Resources>
+        <converters:DateTimeToStringConverter x:Key="DateTimeToStringConverter"/>
+    </Application.Resources>
+</Application>

SQLiteDemo/SQLiteDemo/App.xaml.cs

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+using SQLiteDemo.Common;
+using SQLitePCL;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Media.Animation;
+using Windows.UI.Xaml.Navigation;
+
+// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=234227
+
+namespace SQLiteDemo
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public sealed partial class App : Application
+    {
+
+        public static SQLiteConnection conn;
+
+#if WINDOWS_PHONE_APP
+        private TransitionCollection transitions;
+#endif
+
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+            this.Suspending += this.OnSuspending;
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used when the application is launched to open a specific file, to display
+        /// search results, and so forth.
+        /// </summary>
+        /// <param name="e">Details about the launch request and process.</param>
+        protected async override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+            // Get a reference to the SQLite database
+            conn = new SQLiteConnection("sqlitepcldemo.db");
+            CreateDatabase.LoadDatabase(conn);
+
+#if DEBUG
+            if (System.Diagnostics.Debugger.IsAttached)
+            {
+                this.DebugSettings.EnableFrameRateCounter = true;
+            }
+#endif
+
+            Frame rootFrame = Window.Current.Content as Frame;
+
+            // Do not repeat app initialization when the Window already has content,
+            // just ensure that the window is active
+            if (rootFrame == null)
+            {
+                // Create a Frame to act as the navigation context and navigate to the first page
+                rootFrame = new Frame();
+
+                //Associate the frame with a SuspensionManager key                                
+                SuspensionManager.RegisterFrame(rootFrame, "AppFrame");
+
+                // TODO: change this value to a cache size that is appropriate for your application
+                rootFrame.CacheSize = 1;
+
+                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
+                {
+                    // Restore the saved session state only when appropriate
+                    try
+                    {
+                        await SuspensionManager.RestoreAsync();
+                    }
+                    catch (SuspensionManagerException)
+                    {
+                        // Something went wrong restoring state.
+                        // Assume there is no state and continue
+                    }
+                }
+
+                // Place the frame in the current Window
+                Window.Current.Content = rootFrame;
+            }
+
+            if (rootFrame.Content == null)
+            {
+#if WINDOWS_PHONE_APP
+                // Removes the turnstile navigation for startup.
+                if (rootFrame.ContentTransitions != null)
+                {
+                    this.transitions = new TransitionCollection();
+                    foreach (var c in rootFrame.ContentTransitions)
+                    {
+                        this.transitions.Add(c);
+                    }
+                }
+
+                rootFrame.ContentTransitions = null;
+                rootFrame.Navigated += this.RootFrame_FirstNavigated;
+#endif
+
+                // When the navigation stack isn't restored navigate to the first page,
+                // configuring the new page by passing required information as a navigation
+                // parameter
+                if (!rootFrame.Navigate(typeof(MainPage), e.Arguments))
+                {
+                    throw new Exception("Failed to create initial page");
+                }
+            }
+
+            // Ensure the current window is active
+            Window.Current.Activate();
+        }
+
+#if WINDOWS_PHONE_APP
+        /// <summary>
+        /// Restores the content transitions after the app has launched.
+        /// </summary>
+        /// <param name="sender">The object where the handler is attached.</param>
+        /// <param name="e">Details about the navigation event.</param>
+        private void RootFrame_FirstNavigated(object sender, NavigationEventArgs e)
+        {
+            var rootFrame = sender as Frame;
+            rootFrame.ContentTransitions = this.transitions ?? new TransitionCollection() { new NavigationThemeTransition() };
+            rootFrame.Navigated -= this.RootFrame_FirstNavigated;
+        }
+#endif
+
+        /// <summary>
+        /// Invoked when application execution is being suspended.  Application state is saved
+        /// without knowing whether the application will be terminated or resumed with the contents
+        /// of memory still intact.
+        /// </summary>
+        /// <param name="sender">The source of the suspend request.</param>
+        /// <param name="e">Details about the suspend request.</param>
+        private async void OnSuspending(object sender, SuspendingEventArgs e)
+        {
+            var deferral = e.SuspendingOperation.GetDeferral();
+
+            // Save application state and stop any background activity
+            await SuspensionManager.SaveAsync();
+
+            conn.Dispose();
+            conn = null;
+
+            deferral.Complete();
+        }
+    }
+}