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Figure 3-11. Set intersection This is precisely how an inner join works, but the sets in a join are common elements of the related columns. Pretend that the left set in Figure 3-11 represents values in the foods.type_id column and the right set represents values of the food_types.id column. Given the matching columns, an inner join finds the rows from both sides that contain like values and combines them to form the rows of the result (Figure 3-12). Note that this example assumes that the records shown are the only records in foods and food_types.

If the control doesn t have a ReadOnly property, then the Enabled property is used as a fallback. The same procedure is used, just with the Enabled property instead. Dim couldWrite As Boolean = ctl.Enabled ctl.Enabled = canWrite If (Not couldWrite) AndAlso (canWrite) Then binding.ReadValue() End If The end result is that when the user is denied write access to a business object s property, controls bound to that property are either set to ReadOnly or are disabled. And if the user is denied read access to a business object s property, controls bound to that property are disabled and empty values are placed in the control rather than any real values from the business object.

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Consider the following application design for a StockTrader application for mutual fund trades, which cannot be executed until after the stock exchange closes for the day. Clients can send trade requests to their broker, but they will be stored and processed later, once the stock exchange is closed. Here is the workflow between the client and service:

The BindingSourceRefresh control is also an extender control, but its purpose is quite different from the ReadWriteAuthorization control It turns out that there s a quirk in the way Windows Forms data binding works The BindingSourceRefresh control helps work around this quirk The quirk is that when data is changed in a business object, data binding doesn t always display the changes in the controls on the form This occurs in the following sequence of events: 1 The user edits a value in a bound control 2 Data binding puts the user s new value into the business object 3 The business object alters the value in the property Set block 4 The business object raises its PropertyChanged event You would expect that data binding would handle the PropertyChanged event, realize that the property s data has changed, and then update the control with the new value.

Figure 3-12. Food join as intersection Inner joins only return rows that satisfy the given column relationship, also called the join condition. They answer the question, What rows of B match rows in A given the following relationship Let s demonstrate this in SQL so you can match the theory with a practical example. Select * From foods inner join food_types on foods.id = food_types.id The syntax is clearly understandable once you ve visualized what s happening.

And that does happen for all controls except the current control In other words, the PropertyChanged event causes data binding to refresh all other controls on the form except the control that initiated the change in the first place Obviously, this can be problematic Consider a TextBox control that is bound to a business object property that uses a SmartDate I ll discuss SmartDate in 16, but one of its features is to accept the + character as input and to replace it with tomorrow s date Because of this data binding quirk, when the user enters a + character, that value is put into the business object, which translates it to tomorrow s date but that new value is not displayed to the user The user continues to see the + character.

1. A client decides that they want to place a mutual fund trade. 2. The client formats an XML message with the details of the trade and sends it to the StockTrader Web service. 3. The StockTrader Web service receives the message but does not process the trade immediately. Instead, the Web service drops the message into a queue for later processing. 4. The StockTrader Web service formats an acknowledgment response message to the client to let them know that the trade request has been received and that it will be processed shortly. 5. The client receives the response message. Let s implement this workflow using a TCP-based StockTrader Web service that integrates with a message queue on its host server.

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