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Visual Basic.NET 2005 Design Tools and Wizards in .NET Generator barcode pdf417 in .NET Visual Basic.NET 2005 Design Tools and Wizards




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4.2 Visual Basic.NET 2005 Design Tools and Wizards generate, create pdf 417 none for .net projects Microsoft Office Excel Website Figure 4.8. The Data Source Con guration Wizard. The next step in the Data So urce Con guration Wizard allows you to either select an existing data connection or create a new connection for your data source, which is shown in Figure 4.9. The rst time you run this wizard, there are no preexisting connections available, but on subsequent uses of the wizard you can reuse previously created connections.

To make a new connection, click the New Connection button. The Add Connection dialog box is displayed, which is shown in Figure 4.10a.

You can select different data source types by clicking the Change button. The Change Data Source dialog box is displayed, as shown in Figure 4.10b.

Six popular data sources can be chosen on the basis of your application:. Figure 4.9. The next step in the Data Source Con guration Wizard. Data Selection Query with Visual Basic.NET Figure 4.10. The Add Connection and Change Data Source dialog boxes. 1. 2. 3.

4. 5. 6.

. Microsoft Access Database Fi VS .NET PDF 417 le Microsoft ODBC Data Source Microsoft SQL Server Microsoft SQL Server Database File Microsoft SQL Server Mobile Edition Oracle Database. The second choice allows use rs to select any kind of data source that is compatible with a Microsoft ODBC data source. The fourth choice is for users who select a SQL Server 2005 Express data source. For example, you want to connect your new project with a Microsoft Access database named CSE DEPT.

mdb. You need to keep the default data source as Microsoft Access Database File, and click the Browse button to locate and select that le. You can click the Test Connection button to test your connection.

A Test connection succeeded message will be displayed if your connection is correct, as shown in Figure 4.11. The next step in this wizard allows you to save the connection string to the application con guration le named app.

con g in your new Visual Basic.NET 2005 project. You can save this connection string for future use if you will want to use the same connection again later for your application.

When you click the Next button, a message box will be displayed to ask you if you want to save this data source into your new project, as shown in Figure 4.12. The advantage of saving the data source into your project is that you can combine your project with the data source to make a complete application.

In this way, you will not have to worry about connection problems between your project and your data source, and they will be one body and easily portable. The disadvantage is that the size of your project increases and more memory space is needed to save your application. The next con guration step, which is shown in Figure 4.

13, allows you to select the database objects for this data source. Although you can select any number of. 4.2 Visual Basic.NET 2005 Design Tools and Wizards Figure 4.11. The Add Connection Dialog and Test messagebox. tables, views, and functions PDF-417 2d barcode for .NET , it is highly recommended to select all tables and views. In this way, you can access any table and view any data in all tables.

When you nish selecting your database objects, all selected objects should have been added into the new instance of your DataSet class; in this example it is CSE DEPTDataSet, which can be seen in the DataSet name box shown in Figure 4.13. The data in all tables in your database (CSE DEPT.

mdb) should have been copied to the mapped tables in your DataSet object (CSE DEPTDataSet), and you can use Preview Data to view data in each table in the DataSet. The wizard will build your SELECT statements for you automatically. An important point is that as you nish this Data Source Con guration and close this wizard, the connection you set between your application and your database is closed.

You need to use data query, data manipulation methods, or the Fill method to reopen this connection if you want to perform any data actions between your application and your database later. After the Data Source Con guration is nished, a new data source is added into your project, that is, into the Data Sources window, which is shown in Figure 4.14.

The data source added into your project is actually a DataSet object that contains data tables that are mapped to the tables in your real database. As shown in Figure 4.14, the data source window displays the data source or tables as a tree view, and.

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