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The current EmployeesDB class retrieves the database connection string directly from the web.config file, as shown here: private string connectionString; public EmployeeDB() { connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString; } However, you might want to add another constructor that lets the web page supply a specific connection string of its choosing: public EmployeeDB(string connectionString) { this.connectionString = connectionString; } To force the ObjectDataSource to use this constructor, you need to handle the ObjectCreating event, create the EmployeeDB instance yourself, and then assign it to the data source using the ObjectDataSourceEventArgs: protected void sourceEmployees_ObjectCreating(object sender, ObjectDataSourceEventArgs e) { e.ObjectInstance = new DatabaseComponent.EmployeeDB("..."); } Clearly, you could perform more complex initialization in the ObjectCreating event. For example, you could call an initialization method, choose to instantiate one of several derived classes, and so on.

The data source controls expose a rich event model. Events tend to fall into two categories. Events ending in ing such as ObjectCreating occur while a task is underway and give you the chance to cancel or customize what s happening. Events ending in ed such as ObjectCreated occur when the task is finished and are suitable for logging the action, synchronizing other controls, and handling errors.

The name of the file, including any given path relative to where it was The size of the file s contents, in bytes. objects:

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You can also react to the ObjectDisposing event to perform cleanup. The ObjectDisposing event is fired just before the data access object is released (before the page is served). Usually, you won t need to use the ObjectDisposing event because a better alternative exists place your cleanup code in a dedicated Dispose() method inside your data access class. As long as you implement IDisposable, the ObjectDataSource will automatically call your Dispose() method. (To get a painless implementation of IDisposable for free, just derive your data access class from the System.ComponentModel.Component class and override the Dispose() method.)

Earlier, you saw how you could use the SqlDataSource to execute parameterized commands. The same feat is possible with the ObjectDataSource, if you provide a suitable select method that accepts one or more parameters. You can then map each parameter to a control value, query string argument, and so on. To try this, you can use the EmployeeDB.GetEmployee() method, which retrieves a single employee by ID number. Here s the method declaration:

public EmployeeDetails GetEmployee(int employeeID) { ... } The test page provides a list with all the employee IDs. This list control uses the GetEmployees() method through an Object data source: <asp:ObjectDataSource ID="sourceEmployeesList" runat="server" SelectMethod="GetEmployees" TypeName="DatabaseComponent.EmployeeDB"/> <asp:ListBox ID="lstEmployees" runat="server" DataSourceID="sourceEmployeesList" DataTextField="EmployeeID" AutoPostBack="True"/> When you choose an ID, the page posts back and uses a second data source to call GetEmployee(). The employeeID value is taken from the selected item in the list: <asp:ObjectDataSource ID="sourceEmployee" runat="server" SelectMethod="GetEmployee" TypeName="DatabaseComponent.EmployeeDB"/> <SelectParameters> <asp:ControlParameter ControlID="lstEmployees" Name="employeeID" PropertyName="SelectedValue" /> </SelectParameters> </asp:ObjectDataSource> The name you define for the parameter must match the parameter name you use in the method exactly. When the ObjectDataSource calls the method, it uses reflection to examine the method, and it examines the parameter names to determine the order of arguments. This system allows you to use overloaded methods, because the ObjectDataSource is able to correctly identify the overload you want based on the number of parameters you define and their names.

The data types are not used in the matching process instead, the ObjectDataSource will attempt to convert the parameter value into the data type of the matching parameter using the appropriate type converter for that data type. If this process fails, an exception is raised.

Iterates over the file s contents, yielding it in one or more smaller chunks, to avoid filling up the server s available memory with large files. If no is provided, the , which defaults to 64KB, will be used. Closes the file, so its contents become inaccessible. Writes any new pending contents to the actual filesystem. Returns if the file is big enough to require multiple calls to to retrieve the full contents, or if it can all be read in one pass. The argument works the same as in . Note that this will not actually read the file at this point; it determines the value based on the file s . Reopens the file if it had been previously closed. The argument is optional and will default to whatever mode the file had used when it was last open. without a Retrieves a certain number of bytes from the file. If called argument, this will read the remainder of the file.

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