PcgsInvUi/ViewModels/MainWindowViewModel.cs

@@ -115,11 +115,15 @@ public class MainWindowViewModel : ViewModelBase {
                 
                 // TODO Clear the text boxes.
             });
-
-        // Change TotalValue anytime SelectedCoin.TotalPrice changes.
-        // TODO: fix this. Should update when a coin within the collection is changed.
-        // Possible null deref - how do you remove this?
+        
+        // Update TotalValue anytime a coin's quantity changes.
+        // Possible null reference is currently ignored - SelectedCoin will never be null.
         this.WhenAnyValue(x => x.SelectedCoin.TotalPrice)
             .Subscribe(_ => TotalValue = ConnectedCoinDatabase.Collection.Sum(x => x.TotalPrice));
+
+        // Update TotalValue anytime a coin is added or removed.
+        ConnectedCoinDatabase.Collection.CollectionChanged += (sender, args) => {
+            TotalValue = ConnectedCoinDatabase.Collection.Sum(x => x.TotalPrice);
+        };
     }
 }

PcgsInvUi/Views/MainWindow.axaml

@@ -48,7 +48,7 @@
                                         Binding="{Binding Designation}"
                                         IsReadOnly="True" />
                     <DataGridTextColumn Header="Est. Price" Width="*"
-                                        Binding="{Binding PriceGuideValue}"
+                                        Binding="{Binding PriceGuideValue, StringFormat='${0:0.00}'}"
                                         IsReadOnly="True" />
                     <DataGridTextColumn Header="PCGS #" Width="*"
                                         Binding="{Binding PCGSNo}"
@@ -77,4 +77,4 @@
             </DockPanel>
         </Grid>
     </SplitView>
-</Window>
+</Window>