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8. Add a Click event handler for the Button. Then add the following code: protected void Button1_Click(object sender, EventArgs e) { // set up SQL query for Player table StringBuilder Query = new StringBuilder("SELECT PlayerID, PlayerName, PlayerManufacturerID, PlayerCost, PlayerStorage FROM Player WHERE PlayerManufacturerID IN ("); bool gotResult = false; for (int i = 0; i < ListBox1.Items.Count; i++) { if (ListBox1.Items[i].Selected) { if (gotResult == true) Query.Append(","); Query.Append(ListBox1.Items[i].Value); gotResult = true; } } Query.Append(")"); if (gotResult) { // set the correct SelectCommand SqlDataSource2.SelectCommand = Query.ToString(); } else { // clear the GridView SqlDataSource2.SelectCommand = null; } } 9. Save the page, and then run it in your browser. You ll see the ListBox containing the list of Manufacturers. To select more than one item, hold down the Ctrl key. Clicking the Select button will cause the GridView to be populated with the Manufacturers you ve selected, as shown earlier in Figure 6-18.

By and large, it looks like a normal activity (because it is). Initially, the model a Uri named contact is null. It is set as the result of spawning the ACTION_PICK subactivity. Its string representation is saved in onSaveInstanceState() and restored in restoreMe() (called from onCreate()). If the contact is not null, the View button is enabled and can be used to view the chosen contact. Visually, it looks pretty much as you would expect, as shown in Figures 19 1 and 19 2.

Here s one good example of where the SqlDataSource is not the panacea you might have initially thought it was. The SqlDataSource is ideal when the query that you re executing is simple or more correctly, any parameters that you want to add to it are simple. It works well when all you need to do is find if x = 1 or y < 3, and so on. But it falls down when you need to use conditional statements

There isn t a whole lot to say about the output of svn export, as it s substantially similar to that of svn checkout. Just note that the directory you export to isn t a working copy it has no administrative .svn directory, so you can t use any Subversion commands that require a working copy to function on its contents.

The benefit to this implementation is that it handles a number of system events beyond mere rotation, such as being closed by Android due to low memory. For fun, comment out the restoreMe() call in onCreate() and try running the application. You will see that the application forgets a contact selected in one orientation when you rotate the emulator or device. NOTE: All the samples for this chapter work only on Android 2.0 and higher, as they use the newer means of picking a contact from the Contacts content provider (discussed in 26).

such as IN, and the parameter can t just be added to the query that you want to execute. In these cases, you need to massage the query and change the SelectCommand for the SqlDataSource. The first change that you ll notice is that the second SqlDataSource on the page has a ConnectionString, but it doesn t have a SelectCommand: <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>"> </asp:SqlDataSource> This is perfectly valid, and all it means is that no data binding will take place when a Web control uses this as its data source no SelectCommand, no automatic data binding. So the page when it first loads won t connect to the database to try to show a list of Players in the GridView. In order for the automatic data binding to occur, you must add a SelectCommand. And this is exactly what you do in the Click event handler for the button on the page. The query is constructed in exactly the same way as you saw in the DataReader example. If the user has made a selection from the list, you have a query that you want to run, and you set the SelectCommand property: SqlDataSource2.SelectCommand = Query.ToString(); Once you ve set the SelectCommand to the query, you can let the automatic data binding occur. As you ll recall, this happens after the OnPreRender event, so as long as you ve set the SelectCommand before, you ll be able to rely on the automatic data binding. If no selection has been made, you don t want to run a query. So, you remove the SelectCommand by setting it to null: SqlDataSource2.SelectCommand = null; As there s no query to execute, the automatic data binding won t occur, thus clearing the GridView.

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Summary

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