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CHAPTER 13 s USING DATASETS AND DATA ADAPTERS
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Either typed or untyped datasets are equally valid, but typed datasets are more efficient and can make code somewhat simpler. For example, using an untyped dataset, you d need to write this: Console.WriteLine(ds.Tables(0).Rows(0)("CompanyName")) to get the value for the CompanyName column of the Customers table, assuming that the data table was the first in the dataset. With a typed dataset, you can access its data tables and data columns as class members. You could replace the previous code with this: Console.WriteLine(ds.Customers(0).CompanyName) making the code more intuitive. In addition, the Visual Studio code editor has IntelliSense support for typed datasets. Typed datasets are more efficient than untyped datasets because typed datasets have a defined schema, and when they re populated with data, runtime type identification and conversion aren t necessary, since this has been taken care of at compile time. Untyped datasets have a lot more work to do every time a result set is loaded. However, typed datasets aren t always the best choice. If you re dealing with data that isn t basically well defined, whose definition dynamically changes, or is only of temporary interest, the flexibility of untyped datasets can outweigh the benefits of typed ones. This chapter is already long enough. Since we re not concerned with efficiency in our small sample programs, we won t use typed datasets and we don t need to cover creating them here. Our emphasis in this book is explaining how Visual Basic .NET works with ADO.NET by showing you how to code fundamental operations. If you can code them yourself, you ll have insight into what Visual Basic .NET does when it generates things for you, as in the next chapter on using Windows Forms. This is invaluable for understanding how to configure generated components and debugging applications that use them. Although you can code an .xsd file yourself (or export an XSL schema for an untyped dataset with System.Data.DataSet.WriteXmlSchema() and modify it) and then use the xsd.exe utility to create a class for a typed dataset, it s a lot of work, is subject to error, and is something you ll rarely (if ever) want or need to do.
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In this chapter, we covered the basics of datasets and data adapters. A dataset is a relational representation of data that has a collection of data tables, and each data table has collections of data rows and data columns. A data adapter is an object that controls how data is loaded into a dataset (or data table) and how changes to the dataset data are propagated back to the data source. We presented basic techniques for filling and accessing datasets, demonstrated how to filter and sort data tables, and noted that though datasets are database-independent objects, disconnected operation isn t the default mode. We discussed how to propagate data modifications back to databases with parameterized SQL and the data adapter s UpdateCommand, InsertCommand, and DeleteCommand properties, and how command builders simplify this for single-table updates.
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CHAPTER 13 s USING DATASETS AND DATA ADAPTERS
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We briefly mentioned the important issue of concurrency and then introduced XML, the fundamental technology behind ADO.NET. We provided an example of populating a data table without a dataset, and you should be able to analogize this for all the other operations on datasets that we covered. Finally, we discussed typed and untyped datasets Now that you ve seen the basics of using ADO.NET, we ll move from console applications to Windows applications.
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his chapter introduces you to the concepts related to Windows Forms, which will give you an understanding about Windows Forms and developing Windows Forms Applications using Visual Basic 2008. In this chapter, we ll cover the following: Understanding Windows Forms User interface design principles Best practices for user interface design Working with Windows Forms Understanding the Design and Code views Sorting properties in the Properties window Setting properties of solutions, projects, and Windows Forms Working with controls Setting dock and anchor properties Adding a new form to the project Implementing an MDI form
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