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Note that and only support pickled data strings as plain byte strings, not as full Unicode strings. Since everything in Django gets coerced to Unicode wherever possible, including retrieving from the database, needs to take the extra step of forcing it back to a byte string in order to be unpickled properly.

Figure 9-13. Data binding with extra options So, how can you implement this model with data binding One of the few weaknesses in the data binding model is that you never explicitly handle or create the data object that s bound to the control. As a result, you don t have the chance to add an extra item. In fact, this example has two challenges determining how to add the extra options to the list and reacting when they are selected to override the automatic query logic.

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This problem has a few possible workarounds, but none is perfect. You could rewrite the query so that it returns a result set with an extra hard-coded item. Here s an example: SELECT '(Choose a City)' AS City UNION SELECT DISTINCT City FROM Employees The problem with this approach is that it forces you to add presentation details to the data layer. If your query is in a dedicated stored procedure (which is always a good idea), it will be difficult to reuse this query for other purposes, and it will be awkward to maintain the page. A better choice is to insert this fixed piece of string into the DropDownList programmatically. However, you can t take this step before the data binding takes place, because the data binding process will wipe it from the list. You could override the Page.OnPreRenderComplete() method to perform this task. However, that raises new complications. For one thing, the GridView will have already been filled with data based on the initial DropDownList selection. (Even if you solve this problem, there are other issues related to how changes are detected in the DropDownList selection.) Ultimately, you ll need to resort to programmatic data binding. In normal operation, data source controls are invoked automatically when a linked control needs data or is ready to commit

an update. However, a lesser known fact is that you can also take charge of data source controls programmatically, by calling methods such as Select(), Update(), Insert(), and Delete(). Of course, it s up to you to bind the data you retrieve from Select() and supply the changed data for when committing an update. To put this into practice, start by removing the DropDownList.DataSourceID property. Instead of using this property, you ll bind the control when the page first loads. This gives you the chance to insert the items immediately, before any other data binding actions take place: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { // Trigger the sourceEmployeeCities query and bind the results. lstCities.DataSource = sourceEmployeeCities.Select(DataSourceSelectArguments.Empty); lstCities.DataBind(); // Add the two new items and select the first. lstCities.Items.Insert(0, "(Choose a City)"); lstCities.Items.Insert(1, "(All Cities)"); lstCities.SelectedIndex = 0; } } In this example, the data binding for the list control is performed only once, when the page is requested for the first time. After that, the values in view state are used instead. This code is identical for the SqlDataSource and the ObjectDataSource. That s not true for the remainder of the example.

The next challenge is to intercept clicks on either of the first two items. You can accomplish this by handling the data source Selecting event, which occurs just before the query is executed. You can then check the parameters that are about to be supplied and cancel the operation if needed. Here s the complete code: protected void sourceEmployees_Selecting(object sender, SqlDataSourceSelectingEventArgs e) { if ((string)e.Command.Parameters["@City"].Value == "(Choose a City)") { // Do nothing. e.Cancel = true; } else if ((string)e.Command.Parameters["@City"].Value == "(All Cities)") { // Manually change the command. e.Command.CommandText = "SELECT * FROM Employees"; } } This brute-force approach changing the command using a hard-coded query is ugly. Another approach is to cancel the operation, call another method that returns the appropriate data, and bind that. However, that forces you to do a fair bit of work manually, and mixing manual and automatic data binding can quickly get confusing. Unfortunately, no perfect solution exists.

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