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PortfolioManager/Models/BollingerBandModel.cs

@@ -169,7 +169,7 @@ namespace PortfolioManager.Models
 // The least squares might be in the wrong order if the Bollinger band was already sorted by date
     public static CompositeDataSource LeastSquares(BollingerBands bollingerBands)
     {
-      if (null == bollingerBands || 0 == bollingerBands.Count) return null;
+      if (null == bollingerBands || 0 == bollingerBands.Count) return Empty();
       LeastSquaresResult leastSquaresResult = bollingerBands.LeastSquaresFitClose();
       SortedDateTimeDataAdapter sortedDateTimeDataAdapter = new SortedDateTimeDataAdapter();
       List<BollingerBandElement> sortedBollingerBands = bollingerBands.OrderBy(x => x.Date).ToList();

PortfolioManager/Models/PortfolioTradeModel.cs

@@ -10,17 +10,28 @@ namespace PortfolioManager.Models
 {
   public class PortfolioTradeModel
   {
+
     private PortfolioTradeModel()
     {
     }
+    
+    public static CompositeDataSource Empty()
+    {
+        CompositeDataSource compositeDataSource = new CompositeDataSource()
+        {
+            DataAdapter = new SortedDateTimeDataAdapter()
+        };
+        return compositeDataSource;
+    }    
+
     public static CompositeDataSource PortfolioTrades(PortfolioTrades portfolioTrades)
     {
-      if (null == portfolioTrades || 0 == portfolioTrades.Count) return null;
+      if (null == portfolioTrades || 0 == portfolioTrades.Count) return Empty();
       List<PortfolioTrade> sortedPortfolioTrades = portfolioTrades.OrderBy(x => x.TradeDate).ToList();
       SortedDateTimeDataAdapter sortedDateTimeDataAdapter = new SortedDateTimeDataAdapter();
       foreach (PortfolioTrade portfolioTrade in sortedPortfolioTrades)
       {
-          sortedDateTimeDataAdapter.Add(portfolioTrade.TradeDate, portfolioTrade.Price);
+        sortedDateTimeDataAdapter.Add(portfolioTrade.TradeDate, portfolioTrade.Price);
       }
 
       CompositeDataSource compositeDataSource = new CompositeDataSource()

PortfolioManager/ViewModels/BollingerBandViewModel.cs

@@ -91,6 +91,7 @@ namespace PortfolioManager.ViewModels
     {
       Task workerTask = Task.Factory.StartNew(() =>
       {
+        MDTrace.WriteLine(LogLevel.DEBUG, $"WatchListDA.GetWatchLists()");
         watchListNames = WatchListDA.GetWatchLists();
         watchListNames.Insert(0, UIConstants.CONST_ALL);
         selectedWatchList = watchListNames.Find(x => x.Equals("Valuations"));