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Once you ve cast the previous page to the appropriate page type, you still won t be able to directly access the control values. That s because the controls are declared as protected members. You can handle this by adding properties to the page class that wrap the control variables, like this: public TextBox FirstNameTextBox { get { return txtFirstName; } } public TextBox LastNameTextBox { get { return txtLastName; } } However, this usually isn t the best approach. The problem is that it exposes too many details, giving the target page the freedom to read every control property. If you need to change the page later to use different input controls, it s difficult to maintain these properties. Instead, you ll probably be forced to rewrite code in both pages. A better choice is to define specific, limited methods that extract just the information you need. Here s an example:

public string GetFullName() { get { return txtFirstName.Text + txtLastName.Text; } } This way, the relationship between the two pages is well documented and easily understood. If the controls in the source page are changed, you can probably still keep the same interface for the public methods. For example, if you changed the name entry to use different controls in the previous example, you would still be forced to revise the GetFullName() method. However, once your changes would be confined to CrossPage1.aspx, you wouldn t need to modify CrossPage2.aspx at all.

In many cases, a better alternative to cross-page posting is to use some sort of control that simulates multiple pages or multiple steps, such as separate Panel controls or the MultiView or Wizard control. This offers much the same user experience and simplifies the coding model.

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use if not conveyed to anyone else. This becomes especially important in the case of a framework such as Django, built for distribution to the masses.

As you learned in the previous section, cross-page posting is available only with controls that implement the IButtonControl interface. However, there is a workaround. You can use an overloaded method of Server.Transfer() to switch to a new ASP.NET page with the view state information left intact. You simply need to include the Boolean preserveForm parameter and set it to true, as shown here: Server.Transfer("CrossPage2.aspx", true); This gives you the opportunity to use cross-page posting anywhere in your web-page code. Interestingly, there is a way to distinguish between a cross-page post that s initiated directly through a button and the Server.Transfer() method. Although in both cases you can access Page.PreviousPage, if you use Server.Transfer(), the Page.PreviousPage.IsCrossPagePostBack property is false. Here s the pseudocode that explains it: if (PreviousPage == null) { // The page was requested (or posted back) directly. } else if (PreviousPage.IsCrossPagePostBack) { // A cross-page postback through a button. } else { // A stateful transfer through Server.Transfer(). }

To get a better understanding of how this plays out, consider what happens if two users attempt to commit different updates to an employee record using a method such as UpdateEmployee(), which implements last-in-wins concurrency. The first user updates the mailing address. The second user changes the employee name and inadvertently reapplies the old mailing address at the same time. The problem is that the UpdateEmployee() method doesn t have any way to know what changes you are committing. This means that it pushes all the in-memory values back to the data source, even if these old values haven t been changed (and wind up overwriting someone else s update). If you have large, complex records and you need to support different types of edits, the easiest way to solve a problem like this may be to create more-targeted methods. Instead of creating a generic UpdateEmployee() method, use more-targeted methods such as UpdateEmployeeAddress() or ChangeEmployeeStatus(). These methods can then execute more limited UPDATE statements that don t risk reapplying old values.

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