Conclusion in .NET

Generation Quick Response Code in .NET Conclusion
Conclusion
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Try It!
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Here are a few suggestions for trying some of the techniques presented in this chapter: 1 Add a property to the SalesRep class using Class Designer 2 Try executing the Create methods in the SalesRep class using Object Test Bench 3 Create a code snippet for de ning a property, and include the extra code needed to call the DataStateChanged method Use the XML Code Editor or the Snippet Editor If desired, use the existing property code snippet as a starting point Be sure to try out your snippet 4 Add unit tests for each of the properties and methods in the SalesRep class Use Visual Studio Team System if you have it; otherwise, try out NUnit Run the unit tests to test all the code 5 Build a CustomerList class, and de ne a master/detail relationship between your SalesRep class and the CustomerList class The CustomerList class provides the set of customers for a SalesRep
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6 CLASS TOOLS AND TECHNIQUES
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C H A P T E R
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BINDING THE USER INTERFACE TO THE BUSINESS OBJECTS
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One Ring to rule them all, One Ring to nd them, One Ring to bring them all and in the darkness bind them J R R Tolkien, The Fellowship of the Ring Binding seems a little ominous Haven t we been told since Visual Basic 20 that we should never use binding It incorporated patterns that were not extensible, it did not use good programming practices, and it frequently didn t work as expected But object binding oh my precious yes object binding is another thing entirely This chapter provides object binding fundamentals, including connect-the-dots binding and building user interfaces from business objects It then provides details on enhancing your object binding to support validation The Purchase Tracker sample application is used to demonstrate these techniques Once you see all the things that object binding can do for you, you may be captivated by it as well
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What Does This Cover
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This chapter demonstrates the following techniques:
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Con guring a data source for object binding Using connect-the-dots binding Building a form from a business object Binding to a generic collection Binding to a DataTable De ning business/validation rules in properties Using the ErrorProvider control 357
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7
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Binding the UI to the Business Objects
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Building a Validation class Implementing IDataErrorInfo
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Object binding is great fun You can accomplish much with object binding by simply creating properties in your business object classes and then using Visual Studio to build forms from those business object classes But to get the most from object binding, you also need to incorporate validation and display of data entry errors to the user This chapter covers all these techniques
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NOTE: All the information on object binding in this chapter is for Windows forms only Object binding for the Web is significantly different and is not covered in this book
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Understanding Object Binding
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Before going through the details of how to use object binding, it is important to understand exactly what it is and what it is not Object binding is binding your business object properties to user interface elements Object binding is not database binding in the strict sense of the term It does not directly collect or bind any data from your database When you are using business object classes without object binding, the ow of data from the database to your user interface and back again requires these steps: 1 The business object calls the data access component to get the data from the database and sets the business object properties using that data For example, the Product class calls the data access component, which uses a query or stored procedure to ll a DataTable from the Product table The data access component returns the DataTable to the Product class, which assigns each eld from the table to a property of the object To illustrate, the line of code required to get the ProductName eld from the DataTable and set the ProductName property is as follows:
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myProductProductName = dtRows(0)Item("ProductName")
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