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A common problem for developers is ensuring that data entered by users is valid. That problem is made more difficult when the application exists in a web browser. When the data is sent from the browser to the server, you need to make sure that the data is valid. In addition, users expect some feedback and assistance entering valid data before they spend the time sending it to the server for a response. Fortunately, ASP.NET has a built-in data validation framework for handling this scenario. It provides a straightforward way to accomplish both client-side and server-side validation with minimal coding. Client-side validation is a convenience to users, but it is not a security feature. It improves performance by checking the data at the browser before sending the data to the server. This avoids unnecessary communication with the server. Client-side validation isn t a security feature because a malicious user could easily bypass the client-side validation. Only server-side validation can improve security. Fortunately, ASP.NET makes it easy to build both client-side and server-side validation into webpages.

Figure 19 11 : New objects are allocated in generation 0; generation 1 has more garbage. Let s say that allocating object P causes generation 0 to pass its threshold, causing a garbage collection to occur. Because the memory occupied by all the objects in generation 1 is less than 2 MB, the garbage collector again decides to collect only generation 0, ignoring the unreachable objects in generation 1 (objects B and G). After the collection, the heap looks like Figure 19 12.

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The member list presents itself when you type a dot operator following any class or member name. Every member of the class is listed, and each member s type is indicated by an icon. There are icons for methods, fields, properties, events, and so forth. In addition, each icon may have a second icon overlaid to indicate the accessibility of the member: public, private, protected, and so on. If there is no accessibility icon, the member is public.

the CommandPreload key, which indicates whether the add-in needs to be told to register any commands it might want Many of the problems I've run into while debugging add-ins are related to the commands not getting registered correctly The documentation for the CommandPreload key appears to be wrong; it's not a Boolean field When the CommandPreload key is 1, Visual Studio NET loads the add-in to register its commands When the CommandPreload value is 2, Visual Studio NET assumes the add-in has already registered its commands If you're having trouble with your commands executing, forcing CommandPreload to 1 and restarting the IDE can ensure you get the command registered The LoadBehavior value in your add-in key describes how your add-in is loaded It's a bit field where 0 indicates your add-in is not loaded A value of 1 indicates your add-in should be loaded when the IDE starts up.

Click on the GridView s Smart Tag (if it is not already open). Click the drop-down menu next to Choose Data Source and select the DataSource control you just created, as shown in Figure 4-12.

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A value of 4 indicates your add-in should be loaded when doing command-line builds In Visual Studio NET 2002, there were problems because add-ins were always loaded during command-line builds even when you marked your add-in as not used with command-line builds Fortunately, this bug was fixed for Visual Studio NET 2003 Two registry keys that are not in the default Add-In wizard generated code, but which you'll be adding if you want to have your own command bar bitmaps or other Win32 resources, are SatelliteDllName and SatelliteDllPath Although having your managed bitmaps and resources work in managed add-ins would be quite convenient, Visual Studio NET speaks only COM, so you'll have to put your resources in Microsoft Win32 resource DLLs As you can guess from its name, SatelliteDllName is only the filename of the DLL The other value, SatelliteDllPath, indicates where the satellite DLL resides.

new DownloadStringCompletedEventHandler searchClient_DownloadStringCompleted);

Figure 8.5 User has a one-to-one unidirectional relationship with BillingInfo. The User and BillingInfo entities are mapped to the USERS and BILLING_INFO tables, respectively, and the BILLING_INFO and USERS tables share the same primary key; the primary key of the BILLING_INFO table is also a foreign key referencing the primary key of the USERS table. Such associations are mapped using @PrimaryKeyJoinColumn.

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