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For example, if you have a method that accepts a single string parameter and another method that accepts two string parameters, you ll need to use a separate delegate type for each method To consider how this works in practice, assume your program has the following method: private string TranslateEnglishToFrench(string english) { // Code goes here } This method accepts a single string argument and returns a string With those two details in mind, you can define a delegate that matches this signature Here s how you would do it: private delegate string StringFunction(string inputString); Notice that the name you choose for the parameters and the name of the delegate don t matter The only requirement is that the data types for the return value and parameters match exactly Once you ve defined a type of delegate, you can create and assign a delegate variable at any time.

The GridView provides a DataSource property for the data object you want to display, much like the list controls you saw in 16 Once you ve set the DataSource property, you call the DataBind() method to perform the data binding and display each record in the GridView However, the GridView doesn t provide properties, such as DataTextField and DataValueField, that allow you to choose what column you want to display That s because the GridView automatically generates a column for every field, as long as the AutoGenerateColumns property is True (which is the default) Here s all you need to create a basic grid with one column for each field: <asp:GridView ID="GridView1" runat="server" /> Once you ve added this GridView tag to your page, you can fill it with data Here s an example that performs a query using the ADO.

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Using the StringFunction delegate type, you could create a delegate variable like this: StringFunction functionReference; Once you have a delegate variable, the fun begins Using your delegate variable, you can point to any method that has the matching signature In this example, the StringFunction delegate type requires one string parameter and returns a string Thus, you can use the functionReference variable to store a reference to the TranslateEnglishToFrench() method you saw earlier Here s how to do it: functionReference = TranslateEnglishToFrench;.

NET objects and binds the retrieved DataSet: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles MeLoad ' Define the ADONET objects Dim connectionString As String = _ WebConfigurationManagerConnectionStrings("Northwind")ConnectionString Dim selectSQL As String = _ "SELECT ProductID, ProductName, UnitPrice FROM Products" Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(selectSQL, con) Dim adapter As New SqlDataAdapter(cmd) ' Fill the DataSet Dim ds As New DataSet() adapterFill(ds, "Products") ' Perform the binding GridView1DataSource = ds GridView1DataBind() End Sub Remember, in order for this code to work you must have a connection string named Northwind in the webconfig file (just as you did for the examples in the previous two chapters) Figure 17-1 shows the GridView this code creates Of course, you don t need to write this data access code by hand.

Nonspecialized exceptions are great, but exceptions can be so much better. In Listing 4-1, it would be much more useful if you could examine why the database connection failed. To be able to get this information, you need to integrate Exception with the appropriate function. For example, pg_last_error() provides the reason for a PostgreSQL error. Listing 4-2 demonstrates how to create a custom exception to use when connecting to a PostgreSQL database. Listing 4-2. Creating a Custom Exception Class class DatabaseException extends Exception { protected $databaseErrorMessage; public function __construct($message=null, $code = 0) { $this->databaseErrorMessage = pg_last_error(); parent::__construct($message, $code); } protected function getDatabaseErrorMessage() { return $this->databaseErrorMessage; } } This code defines a DatabaseException class that extends from Exception and that declares a new method. This method will record the pg_last_error() in context and expose it for later access. When creating this class, you must be careful to call the base class s constructor, as failing to do this can result in unreliable and often unstable behavior within PHP. Listing 4-3 shows how to use this new exception.

Note When you assign a method to a delegate variable in C#, you don t use brackets after the method name.

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