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copied!<p>Store the times in your application storage.</p> <p><a href="http://www.jeffblankenburg.com/2010/10/15/31-days-of-windows-phone-day-15-isolated-storage/" rel="nofollow">http://www.jeffblankenburg.com/2010/10/15/31-days-of-windows-phone-day-15-isolated-storage/</a></p> <p><strong>Update:</strong> This will make it 4 U: </p> <pre class="lang-cs prettyprint-override"><code>private void Application_Launching(object sender, LaunchingEventArgs e) { EnsureCheckThreeDaysInARow(); } private void Application_Activated(object sender, ActivatedEventArgs e) { EnsureCheckThreeDaysInARow(); } public bool EnsureCheckThreeDays() { IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings; if (settings.Contains("threeMagicalDay")) { var data = new List<DateTime>(); if (data.Count() >= 3 && !data.Any(a => a.Date == DateTime.Now.Date)) data.Remove(data.Min()); data.Add(DateTime.Now); var someTransform = data.OrderByDescending(a => a).Select(b => new Tuple<int,int,int>(b.Year,b.Month, b.Day)).Aggregate((c,d) => new Tuple<int,int,int>(c.Item1 - d.Item1, c.Item2 - d.Item2, c.Item3 - d.Item3)); if (someTransform.Item1 == -DateTime.Now.Date.Year && someTransform.Item2 == -DateTime.Now.Date.Month && someTransform.Item3 == 0) { //There you go... } else { //Handle it... } settings["threeMagicalDay"] = data; } else settings.Add("threeMagicalDay", new List<DateTime>(){DateTime.Now}); return false; } </code></pre>

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