.net barcode reader dll Figure 8-24. Choosing a data source in Font

Creator PDF-417 2d barcode in Font Figure 8-24. Choosing a data source

Figure 8-24. Choosing a data source
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CHAPTER 8 INTRODUCTION TO DATABASE TESTING
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Once the DataGridView is mapped to a data source, in this case the Products table in the DataSet, you need to tell the DataAdapter to fill up the table. You can do this simply by adding a button to the form and having it run the Fill() method of the DataAdapter class. If you had created other controls on the form, such as a ComboBox or a ListBox, and mapped them to the Products table as well, you would see these controls fill with data too, just using this single command. VB. NET Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click OleDbDataAdapter1.Fill(ProductsDataSet1) End Sub End Class C# public class Form1 { private void Button1_Click(object sender, System.EventArgs e) { OleDbDataAdapter1.Fill(ProductsDataSet1); } } One final thing you might want to do is anchor the DataGridView to the four sides of the Windows Form. This will make it expand along with the Form, thereby allowing you to see more of the data. To set this, right-click the DataGridView and select Properties from the menu. Then, locate the Anchor property and use the visual control to set the property, as shown in Figure 8-25.
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Figure 8-25. Setting the Anchor property When all is set, run the project and click the button to see your results (see Figure 8-26). The data should display within the DataGridView. You can even edit that data from this control, but keep in mind this option only works well for some queries. If your project uses complex SQL queries to create your DataSets, you will have to invest more time customizing the code the wizards and dialog screens created for you.
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CHAPTER 8 INTRODUCTION TO DATABASE TESTING
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Figure 8-26. The completed DataGridView form As you can see, DataGrids make it easy to display data from a database. Since storing and retrieving data from a database is a common testing task, and since testware development budgets are usually tight or nonexistent, you may find these tools both quick and useful.
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Summary
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This chapter has been an introduction to using the power of .NET and Visual Studio to access and work with databases on a test project. In the process, you ve been introduced to the Database Explorer tool, a few of ADO.NET s major objects, and both the ASP.NET data source controls and the more advanced DataAdapter/DataSet controls. With all of this, you ve still only just touched the tip of the iceberg. This topic is large enough to span an entire book. We encourage you to follow up our primer with continued practice and study. There are more resources for the database application tester and, specifically, the .NET tester. Check out QA Forums (www.qaforums.com) and other testing groups for links to database testing resources. Our resource list in Appendix C will help you in this next step.
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CHAPTER 8 INTRODUCTION TO DATABASE TESTING
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Tester s Checklist
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When testing a relational database, Use the Database Explorer tools to quickly and easily connect to a database and visually verify data. Use ADO.NET to connect to a database programmatically if you need to save and run automated scripts to test the database. Save queries you have found that find data problems. Start with those SQL queries in the Executing Database Queries Using the Query Designer section of this chapter. These queries can be used programmatically by using ADO.NET or they can be used within the Database Explorer tools. Take a class to learn about more if needed. Use the data source controls and create a web application for quick database access. Use the DataAdapter and DataSet controls and create more powerful database access. Study further and become proficient at database design and SQL to be most effective at database testing.
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