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One problem with the UpdateEmployee() method shown in the previous example is that the method signature is a little cumbersome you need one parameter for each property in the data object. Seeing as you already have a definition for the EmployeeDetails class, it makes sense to create an UpdateEmployee() method that uses it and gets all its information from an EmployeeDetails object. Here s an example: public void UpdateEmployee(EmployeeID emp) { ... } The ObjectDataSource supports this approach. However, to use it, you must set the DataObjectTypeName to the full name of the class you want to use. Here s how it works: <asp:ObjectDataSource ID="sourceEmployees" runat="server" TypeName="DatabaseComponent.EmployeeDB" DataObjectTypeName="DatabaseComponent.EmployeeDetails" ... /> Once this is in place, the ObjectDataSource will match only the UpdateMethod, DeleteMethod, or InsertMethod if it has a single parameter that accepts the type specified in DataObjectTypeName. Additionally, your data object must follow some rules: It must provide a default (zero-argument) constructor. For every parameter, there must be a property with the same name. (Public variables are ignored.) All properties must be public and writable. You re free to add code to your data object class. For example, you can add methods, constructors, validation and event-handling logic in your property procedures, and so on.

Sometimes you may run into a problem in which the property names of your data class don t exactly match the parameter names of your update method. If all you need is a simple renaming job, you need to perform the task that was described in the Updating with Stored Procedures section earlier, although the syntax is slightly different. First, you define the additional parameters you need, with the correct names. For example, maybe you need to rename the EmployeeDetails.EmployeeID property to a parameter named id in the update method. Here s the new parameter you need: <asp:ObjectDataSource ID="sourceEmployees" runat="server" TypeName="DatabaseComponent.EmployeeDB" SelectMethod="GetEmployees" UpdateMethod="UpdateEmployee" OnUpdating="sourceEmployees_Updating" > <UpdateParameters> <asp:Parameter Name="id" Type="Int32" /> </UpdateParameters> </asp:ObjectDataSource> Second, you react to the ObjectDataSource.Updating event, setting the value for these parameters and removing the ones you don t want: protected void sourceEmployees_Updating(object sender, ObjectDataSourceMethodEventArgs e) { e.InputParameters["id"] = e.InputParameters["EmployeeID"]; e.InputParameters.Remove("EmployeeID"); }

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Using cookies: In this case, the session ID is transmitted in a special cookie (named ASP.NET_SessionId), which ASP.NET creates automatically when the session collection is used. This is the default, and it s also the same approach that was used in earlier versions of ASP. Using modified URLs: In this case, the session ID is transmitted in a specially modified (or munged ) URL. This is a new feature in ASP.NET that allows you to create applications that use session state with clients that don t support cookies. You ll learn more about how to configure cookieless sessions and different session state providers later in the Configuring Session State section.

To make the translation between a full Python object and a string representation that can be stored in the database, Python s pickling modules9 will be the tool of choice. There are actually two separate modules provided by Python for this purpose: , written in C for improved performance, and , written in pure Python for flexibility and portability. There are some minor differences between the two,10 but they can be used interchangeably. Having two modules available makes importing a bit trickier than usual. For obvious reasons, it s very valuable to have the greater performance when it s available, but a key aspect of Python and Django is the ability to be used across multiple platforms and environments. Therefore, when looking to import a pickling module, it s best to try the more efficient module first, falling back to the more portable module when necessary.

You can interact with session state using the SystemWebSessionStateHttpSessionState class, which is provided in an ASPNET web page as the built-in Session object The syntax for adding items to the collection and retrieving them is basically the same as for adding items to the view state of a page For example, you might store a DataSet in session memory like this: Session["ds"] = ds; You can then retrieve it with an appropriate conversion operation: ds = (DataSet)Session["ds"]; Session state is global to your entire application for the current user Session state can be lost in several ways: If the user closes and restarts the browser If the user accesses the same page through a different browser window, although the session will still exist if a web page is accessed through the original browser window Browsers differ on how they handle this situation.

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