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The next step is to modify the StoreDB.GetProducts() method so that it returns a collection of Product objects instead of a DataTable. Here s the revised code: public class StoreDB { public List<Product> GetProducts() { // Get the connection string from the .config file. string connectionString = Properties.Settings.Default.Store; // Create the ADO.NET objects. SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand("GetProducts", con); cmd.CommandType = CommandType.StoredProcedure; List<Product> products = new List<Product>(); try { con.Open(); SqlDataReader reader = cmd.ExecuteReader(); while (reader.Read()) { // Create a Product object that wraps the // current record. Product product = new Product((string)reader["ModelNumber"], (string)reader["ModelName"], (decimal)reader["UnitCost"], (string)reader["Description"]); // Add to collection products.Add(product); } } finally { con.Close(); } return products; } } You can now use this new version of the StoreDB class to create a quick data-bound list. In fact, you can exactly duplicate the result in Figure 8-5 (which binds to a DataTable) using the same code: private void SimpleListBinding_Load(object sender, EventArgs e) { lstModelName.DataSource = Program.StoreDB.GetProducts(); lstModelName.DisplayMember = "ModelName"; }

Here, .NET uses reflection to examine the bound Product objects, searching for a property named ModelName. It then displays the value in the list. However, there s a difference hidden behind the scenes. In the DataTable example, the list actually binds to DataRow objects and displays field values. In this example, the list binds to Product instances. When you retrieve the currently selected item, you ll find that it s a full Product object, complete with all the Product properties. This allows you to get other related information. To test this out, add the following code and attach it to the lstModelName.DoubleClick event that fires when an item in the list is double-clicked: private void lstModelName_DoubleClick(object sender, System.EventArgs e) { Product product = (Product)lstModelName.SelectedItem; MessageBox.Show(String.Format("Costs {0:C}", product.UnitCost)); } Now when you double-click any item in the list, you ll see its price (Figure 8-20).

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These blocks are kept in memory (inside a KEY_CACHE struct instance), and the KEY_CACHE keeps track of how warm 10 the index data is for instance, how frequently the index data block is requested After a time, cold index blocks are purged from the internal buffers This is a sort of least recently used (LRU) strategy, but the key cache is smart enough to retain blocks that contain index data for the root B-tree levels The number of blocks available inside the KEY_CACHE s internal list of used blocks is controlled by the key_buffer_size configuration variable, which is set in multiples of the key cache block size The key cache is created the first time a MyISAM table is opened The multi_key_cache_ search() function (found in /mysys/mf_keycachesc) is called during the storage engine s mi_open() function call.

After appending this prefix, your Windows logon account should look something like this:

Figure 8-20. Binding objects to a list The products collection works just as well if you want to create forms that have several data-bound controls. The only difference is that the object you bind is a List<Product> collection, not a DataTable: // Get the data object. List<Product> products = Program.StoreDB.GetProducts(); // Set up the bindings. cboModelName.DataSource = products; cboModelName.DisplayMember = "ModelName"; lblModelNumber.DataBindings.Add("Text", products, "ModelNumber"); lblUnitCost.DataBindings.Add("Text", products, "UnitCost"); lblDescription.DataBindings.Add("Text", products, "Description");

When a user connection attempts to access index (key) data from the MyISAM table, the table s key cache is first checked to determine whether the needed index block is available in the key cache If it is, the key cache returns the needed block from its internal buffers If not, the block is read from the relevant MYI file into the key cache for storage in memory Subsequent requests for that index block will then come from the key cache, until that block is purged from the key cache because it is not used frequently enough Likewise, when changes to the key data are needed, the key cache first writes the changes to the internally buffered index block and marks it as dirty.

Visual Studio 2005 includes a new feature for creating a rich design-time experience smart tags. Smart tags are the pop-up windows that appear next to a control when you click the tiny arrow in the corner. Smart tags are similar to menus in that they have a list of items. However, these items can be commands (which are rendered like hyperlinks), or other controls like check boxes, drop-down lists, and more. They can also include static descriptive text. In this way, a smart tag can act like a mini Properties window. Figure 26-4 shows an example of the custom smart tag that s created in the next example. It allows the developer to set a combination of GradientPanel properties. It includes three

You can now create this user in the database and grant it connect privileges in SQL*Plus:

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