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You ll explore the rich data controls in detail in 10. However, it s worth taking a look at a quick example now with the GridView, because you ll use it to work through a variety of examples in this chapter. Like the list controls, the GridView provides a DataSource property for the data object and a DataBind() that triggers it to read the data object and display each record. However, you don t need to use properties such as DataTextField and DataValueField, because the GridView automatically generates a column for every property (if you re binding to a custom object) or every field (if you re binding to a row). Here s all you need to get this basic representation: <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="True" /> Now, define a query that selects several fields from the Employees table: string sql = "SELECT EmployeeID, FirstName, LastName, Title, City " + "FROM Employees"; You can bind the GridView to a DataReader in the same way you bound the list control in the previous example. Only the name of the control changes: grid.DataSource = reader; grid.DataBind(); Figure 9-4 shows the GridView this code creates.
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You can write the data source logic by hand or by using a design-time wizard that lets you create a connection and then create the command logic in a graphical query builder. To launch this tool, select the data source control, and choose Configure Data Source from the smart tag.
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config file so that it overrides the inherited value for the current application only You can also use the SaveAs() method to save configuration settings to another file When calling ConfigurationSave(), you can use an overloaded version of the method that accepts a value from the ConfigurationSaveMode enumeration Use Modified to save any value you changed, even if it doesn t differ from the inherited values Use Full to save everything in the local webconfig, which is useful if you re trying to duplicate configuration settings for testing or deployment Finally, use Minimal to save only those changes that differ from the inherited levels this is the default..
Figure 9-4. The bare-bones GridView Of course, you can do a lot more to configure the appearance of the GridView and can use advanced features such as sorting, paging, and editing. You ll learn about these features throughout this chapter and in the next chapter. You can also give your GridView a quick face-lift by choosing Auto Format from the GridView s smart tag.
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Once you ve created the data source, you can reap the benefits namely, the ability to bind your controls at design time, rather than writing logic in the event handler for the Page.Load event. Here s how it works: 1. Select the data source control, and click Refresh Schema in the smart tag. This step triggers the data source control to connect to the database and retrieve the column information for your query. The advantage is this column information will now be available in handy dropdown boxes in the appropriate part of the Properties window. (If you don t take this step, or the database isn t available at design time, you ll need to type in field names by hand.) 2. Add a ListBox to your form. Set the ListBox.DataSourceID property to the data source control. You can choose it from a drop-down list that shows all the data sources on the form (see Figure 9-6). 3. Set the ListBox.DataTextField to the column you want to display (in this case, choose EmployeeID). The list of fields should also be provided in a drop-down list (see Figure 9-6).
When Microsoft released ASP.NET 1.0, even it didn t anticipate how enthusiastically the technology would be adopted. ASP.NET quickly became the standard for developing web applications with Microsoft technologies and a heavy-hitting competitor against all other web development platforms.
You will encounter a few limitations when you bind directly to a DataReader. Because the DataReader is a forward-only cursor, you can t bind your data to multiple controls. You also won t have the ability to apply custom sorting and filtering criteria on the fly. Finally, unless you take care to code your page using generic interfaces such as IDataReader, you lock your code into the data provider you re currently using, making it more difficult to modify or adapt your code in the future. To solve these problems, you can use the disconnected ADO.NET data objects. If you fill a disconnected DataSet, you can bind that to one or more controls, and you can tailor the sorting and filtering criteria. The DataSet is also completely generic no matter which data provider you use to fill your DataSet, the DataSet itself (and the data binding code) looks the same. Technically, you never bind directly to a DataSet or DataTable object. Instead, you bind to a DataView object. A DataView represents a view of the data in a specific DataTable. That means the following: grid.DataSource = dataTable; grid.DataBind(); is equivalent to this: grid.DataSource = dataTable.DefaultView; grid.DataBind();
Table 6-2. State Management Options Compared (Part 2)