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MORE INFO
QR Code JIS X 0510 Creation In Visual Studio .NET
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Printing Barcode In .NET Framework
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Practice tests
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For details about all the practice test options available, see the How to Use the Practice Tests sec tion in this book s Introduction.
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8
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Implementing Data-Bound Controls
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This chapter describes how to display data on Windows Forms. When controls on a form are data-bound, the underlying data source stays in synch with the values in the controls. Windows Forms provide classes for binding data between a Windows Form control, such as a TextBox, and data from a data source. Data binding allows you to bring data into your application, typically into a dataset, then allows users to modify that data by editing values in controls bound to that data and sending the changes back to the database. The data-binding infrastructure handles most of the behind-the scenes tasks such as keeping the control in synch with the DataTable.
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Exam objectives in this chapter:
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Implement data-bound controls.
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Use the DataGridView control to display and update the tabular data con tained in a data source. Use a simple data-bound control to display a single data element on a Windows Form. Implement complex data binding to integrate data from multiple sources. Navigate forward and backward through records in a dataset in Windows Forms. Enhance navigation through a dataset by using the DataNavigator compo nent. Define a data source by using a DataConnector component. Create data forms by using the Data Source Configuration Wizard and Data Sources window.
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Lessons in this chapter:
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Bar Code Generation In None
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Lesson 1: Creating a Data-Bound Form with the Data Sources Wizard . . . . 411 Lesson 2: Implementing Data-Bound Controls . . . . . . . . . . . . . . . . . . . . . . . . . 416 Lesson 3: Working with the DataGridView . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
8
Implementing Data-Bound Controls
Before You Begin
To complete the lessons in this chapter, you must have:
A computer that meets or exceeds the minimum hardware requirements listed in the Introduction at the beginning of the book. Microsoft Visual Studio 2005 Professional Edition installed on your computer. An understanding of Microsoft Visual Basic or C# syntax and familiarity with the Microsoft .NET Framework. Available data sources, including Microsoft SQL Server (SQL Server Express Edi tion is acceptable), the Northwind Traders sample database for SQL Server, and the Nwind.mdb Microsoft Office Access database file. A basic understanding of relational databases. Completed the exercises or understood the concepts presented in 5, Configuring Connections and Connecting to Data.
Real World
Steve Stein Some of my first applications that accessed data had more code written to move data in and out of the user interface than the code to load, validate, and update data combined. If you consider the maintenance nightmare of such an applica tion paired together with the flawed logic I was typically guilty of introducing into applications back then, you can imagine the countless hours involved. Using Windows Forms data binding is an excellent way to present data to users.
Lesson 1: Creating a Data-Bound Form with the Data Sources Wizard
Lesson 1: Creating a Data-Bound Form with the Data Sources Wizard
This lesson describes how to create a Windows Form that displays data in a DataGridView using the Data Source Configuration Wizard and the Data Sources window.
After this lesson, you will be able to:
Create data forms by using the Data Form Wizard. How to run the Data Source Configuration Wizard to create data-bound Windows Forms and see what options you can choose and what the wizard generates.
Estimated lesson time: 20 minutes
What Does the Wizard Create
Running the Data Source Configuration Wizard creates a typed DataSet in your appli cation and populates the Data Sources window with the objects selected while run ning the wizard. After running the wizard, you still need to drag items onto your form to create the instances of the objects needed to access the data.
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