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aspx: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="CrossPage1aspxcs" Inherits="CrossPage1" %> <html> <head runat="server"> <title>CrossPage1</title> </head> <body> <form id="form1" runat="server" > <div> <asp:TextBox runat="server" ID="txtFirstName"></asp:TextBox>   <asp:TextBox runat="server" ID="txtLastName"></asp:TextBox> <asp:Button runat="server" ID="cmdSubmit" PostBackUrl="CrossPage2aspx" Text="Submit" /> </div> </form> </body> </html> In CrossPage2aspx, the page can interact with the CrossPage1aspx objects using the PagePreviousPage property Here s an example: protected void Page_Load(object sender, EventArgs e) { if (PreviousPage != null) { lblInfoText = "You came from a page titled " + PreviousPageHeaderTitle; } } Note that this page checks for a null reference before attempting to access the PreviousPage object If there s no PreviousPage object, there s no cross-page postback ASPNET uses some interesting sleight of hand to make this system work The first time the second page accesses PagePreviousPage, ASPNET needs to create the previous page object.

A variable is a parameter denoted by a name; a name is a word containing only letters, numbers, or underscores and beginning with a letter or an underscore. Values can be assigned to variables in the following form: name=VALUE Many variables are set by the shell itself, including three you have already seen: HOME, PWD, and PATH. With only two minor exceptions, auto_resume and histchars, all the variables set by the shell are all uppercase letters.

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To do this, it actually starts the page processing but interrupts it just before the PreRender stage Along the way, a stand-in Response object is created to silently catch and ignore any ResponseWrite() commands from the previous page However, there are still some interesting side effects For example, all the page events of the previous page are fired, including PageLoad, PageInit, and even the ButtonClick event, for the button that triggered the postback (if it s defined) Firing these events is mandatory, because they are required to properly initialize the page Trace messages aren t ignored like Response messages, which means you may see tracing information from both pages in a crossposting situation..

You can use three basic transaction types in an ASP.NET web application. They are as follows (from least to most overhead): Stored procedure transactions: These transactions take place entirely in the database. Stored procedure transactions offer the best performance, because they need only a single round-trip to the database. The drawback is that you also need to write the transaction logic using SQL statements (which may be not as easy as using pure C#). Client-initiated (ADO.NET) transactions: These transactions are controlled programmatically by your ASP.NET web-page code. Under the covers, they use the same commands as a stored procedure transaction, but your code uses some ADO.NET objects that wrap these details. The drawback is that extra round-trips are required to the database to start and commit the transaction. COM+ transactions: These transactions are handled by the COM+ runtime, based on declarative attributes you add to your code. COM+ transactions use a two-stage commit protocol and always incur extra overhead. They also require that you create a separate serviced component class. COM+ components are generally a good choice only if your transaction spans multiple transaction-aware resource managers, because COM+ includes built-in support for distributed transactions. For example, a single COM+ transaction can span interactions in a SQL Server database and an Oracle database. COM+ transactions are not covered in this chapter, although you will consider them briefly with web services in 32.

This illustrates a simple approach at combining dictionaries, using the fact that can accept both a dictionary and keyword arguments, combining them into a new dictionary. Thanks to the syntax described in detail in 2, this make it a convenient way to achieve the desired result, but the example also shows where it starts to fail. First, it only accepts two dictionaries; adding more would require calling more than once, adding a new dictionary each time. Perhaps more importantly, updates to the source dictionaries don t get reflected in the combined structure. To be clear, this is ordinarily a good thing, but in cases like , which combines and , changes made to the underlying dictionaries should also be revealed in the combined output. To facilitate all of this, Django uses its own class that acts like a dictionary in many respects, but transparently accesses multiple dictionaries behind the scenes. There s no limit to the number of dictionaries that can be accessed this way. Simply supply as many dictionaries as needed when instantiating the object, and they ll be accessed in the order they re provided. Since it stores references to the real dictionaries and accesses them instead of creating a new one, modifications to the underlying dictionaries are reflected in the composite.

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