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You ll need code that inserts the ID number for each selected Manufacturer into the query. You re using a StringBuilder, rather than normal string concatenation, as the StringBuilder is more efficient. You first add the start of the SELECT query you want to execute, like so: // set up SQL query for Player table StringBuilder Query = new StringBuilder("SELECT PlayerID, PlayerName, PlayerManufacturerID, PlayerCost, PlayerStorage FROM Player WHERE PlayerManufacturerID IN ("; The strategy here is to iterate through each item in the list and see if it has been selected. Fortunately, each ListItem object has a Selected property, which is true if it has been selected and false otherwise. If it has been selected, you pull its Value into the query. 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; } } You ve included the Boolean gotResult to keep track of whether anything has been selected. You need to comma separate the selected entries, so you use gotResult to decide if you need to add a comma to the end of the query. The gotResult variable is also used to decide whether you need to populate the GridView. If the user has selected at least one entry in the ListBox, you set the CommandText property of the Command object and execute the query to populate the GridView. If the user has unselected all the items in the list, you clear the GridView. This will ensure that the list of Players doesn t appear when you don t have a Manufacturer selected: if (gotResult) { myCommand.CommandText = Query.ToString(); // run the query SqlDataReader myReader = myCommand.ExecuteReader(); // set up the GridView GridView1.DataSource = myReader; GridView1.DataBind(); // close the reader myReader.Close(); }

public class RotationOneDemo extends Activity { static final int PICK_REQUEST=1337; Button viewButton=null; Uri contact=null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btn=(Button)findViewById(R.id.pick); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { Intent i=new Intent(Intent.ACTION_PICK, Contacts.CONTENT_URI); startActivityForResult(i, PICK_REQUEST); } }); viewButton=(Button)findViewById(R.id.view); viewButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { startActivity(new Intent(Intent.ACTION_VIEW, contact)); } }); restoreMe(savedInstanceState); viewButton.setEnabled(contact!=null); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode==PICK_REQUEST) { if (resultCode==RESULT_OK) { contact=data.getData(); viewButton.setEnabled(true); } } } @Override

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else { // clear the GridView GridView1.DataSource = null; GridView1.DataBind(); } So nothing much has changed really. You re modifying the query that you want to execute to handle multiple selected values, but the rest of the code remains the same. The same is true if you look at the DataSet version of the page in the code download. However, all is not the same when you want to use a SqlDataSource.

protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (contact!=null) { outState.putString("contact", contact.toString()); } } private void restoreMe(Bundle state) { contact=null; if (state!=null) { String contactUri=state.getString("contact"); if (contactUri!=null) { contact=Uri.parse(contactUri); } } } }

In this example, you ll see how you need to write code when you want to control how the SqlDataSource behaves. 1. In Visual Web Developer, create a new Web Form called List_DataSource_Multiple.aspx. 2. Change the <title> of the page to Multiple Selection Using a SqlDataSource. 3. Make sure you ve included the correct Import statement at the top of the page. <%@ Page Language="C#" %> <%@ Import Namespace="System.Text" %> 4. In the Design view, add a ListBox, a Button, and a GridView to the page. Change the Text for the Button to Select. You can use a table to lay out the Web controls in a more userfriendly manner, as shown earlier in Figure 6-17. 5. For the ListBox, set DataTextField to ManufacturerName, DataValueField to ManufacturerID, and SelectionMode to Multiple. 6. You need two SqlDataSource controls for this example, but rather than using the graphical tools to create them, you can add them directly to the HTML markup. Switch to the Source view and add the definitions for the two SqlDataSource controls at the top of the page: <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>" SelectCommand="SELECT ManufacturerID, ManufacturerName FROM Manufacturer"> </asp:SqlDataSource> <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>"> </asp:SqlDataSource> 7. Switch to the Design view and set the DataSourceID for the ListBox to SqlDataSource1 and for the GridView to SqlDataSource2.

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