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Figure 8-1. The Web control layout for Player_Insert.aspx 10. Add a Page_Load event handler to the page, as follows: protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack == false) { // populate the list of manufacturers PopulateManufacturers(); } } 11. Add the PopulateManufacturers() method: private void PopulateManufacturers() { // create the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(strConnectionString); try { // query to execute string strQuery = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer ORDER BY ManufacturerName"; // create the command SqlCommand myCommand = new SqlCommand(strQuery, myConnection);

The onCreate() implementation delegates most of its logic to a setupViews() method, which loads the layout and sets up the buttons. This logic was broken out into its own method because it is also called from onConfigurationChanged().

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// open the database connection myConnection.Open(); // run query SqlDataReader myReader = myCommand.ExecuteReader(); // set the data source and bind ManufacturerList.DataSource = myReader; ManufacturerList.DataTextField = "ManufacturerName"; ManufacturerList.DataValueField = "ManufacturerID"; ManufacturerList.DataBind(); // close the reader myReader.Close(); } finally { // always close the database connection myConnection.Close(); } } 12. Switch to the Design view of the page and add a DataBound event handler for the ManufacturerList control. Add the following code to the event handler: protected void ManufacturerList_DataBound(object sender, EventArgs e) { ListItem myListItem = new ListItem(); myListItem.Text = "please select..."; myListItem.Value = "0"; ManufacturerList.Items.Insert(0, myListItem); } 13. With the Web control layout sorted and populated as required, you need to implement the code to insert the Player into the database. Switch back to the Design view of the page and double-click the SubmitButton control to add a Click event handler. Add the following code to the event handler: protected void SubmitButton_Click(object sender, EventArgs e) { // save the player to the database int intPlayerID = SavePlayer(); // did an error occur if (intPlayerID == -1) { QueryResult.Text = "An error has occurred!"; }

else { // show the result QueryResult.Text = "Save of player '" + intPlayerID.ToString() + "' was successful"; // disable the submit button SubmitButton.Enabled = false; } } 14. To insert the Player into the database, you call a function named SavePlayer(). This function returns the PlayerID for the new entry, or it returns -1 if an error occurs: private int SavePlayer() { int intPlayerID = 0; // create the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(strConnectionString); try { // query to execute string strQuery = "INSERT Player (PlayerName, PlayerManufacturerID, PlayerCost, PlayerStorage) VALUES (@Name, @ManufacturerID, @Cost, @Storage); SELECT SCOPE_IDENTITY();"; // create the command SqlCommand myCommand = new SqlCommand(strQuery, myConnection); // add the parameters myCommand.Parameters.AddWithValue("@Name", PlayerName.Text); myCommand.Parameters.AddWithValue("@ManufacturerID", ManufacturerList.SelectedValue); myCommand.Parameters.AddWithValue("@Cost", PlayerCost.Text); myCommand.Parameters.AddWithValue("@Storage", PlayerStorage.Text); // open the connection myConnection.Open(); // execute the query intPlayerID = Convert.ToInt32(myCommand.ExecuteScalar()); } catch {

In the previous three sections, we covered ways to deal with rotational events. There is, of course, a radical alternative: tell Android not to rotate your activity at all. If the activity does not rotate, you do not need to worry about writing code to deal with rotations. To block Android from rotating your activity, all you need to do is add android:screenOrientation = "portrait" (or "landscape", as you prefer) to your AndroidManifest.xml file, as follows (from the Rotation/RotationFour sample project):

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// return -1 to indicate error intPlayerID = -1; } finally { // close the connection myConnection.Close(); } // return the ID return(intPlayerID); } 15. Finally, you need to provide a means for the user to return to the list of Players. Switch to the Design view and double-click the ReturnButton. Add the following code to the Click event handler: protected void ReturnButton_Click(object sender, EventArgs e) { Response.Redirect("./Players.aspx"); } 16. Save the page, and then open the Web site in your browser. In the list of Players, click the Add Player link. On the following page, add the details for a new Player. Then click the Insert Player button to execute the INSERT query and return the ID of the Player added, as shown in Figure 8-2.

< xml version="1.0" encoding="utf-8" > <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.commonsware.android.rotation.four" android:versionCode="1" android:versionName="1.0.0"> <uses-sdk android:minSdkVersion="5" android:targetSdkVersion="6"

17. Click the Return to Player List button. You ll see that the new Player has been added to the end of the list of Players, as shown in Figure 8-3.