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The update command in the previous example matches the record based on its ID. The problem with this approach is that the update command updates every field indiscriminately it has no way to distinguish between fields that are and aren t changed. As a result, you can end up obliterating the changes of another user, if they are made between the time the page is requested and the time the page is updated. For example, imagine Chen and Lucy are viewing the same table of employee records. Lucy commits a change to the address of an employee. A few seconds later, Chen commits a name

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Figure 5-11. The ASP .NET request processing architecture ASP .NET uses a core set of HTTP modules to enable platform features such as caching, authentication, and error pages. You can add or remove HTTP modules with <add> and <remove> tags in the <httpModules> section of a configuration file. Here s an excerpt showing some of the HTTP modules that are defined in the machine.config file: <httpModules> <add name="OutputCache" type="System.Web.Caching.OutputCacheModule"/> <add name="Session" type="System.Web.SessionState.SessionStateModule"/> <add name="WindowsAuthentication" type="System.Web.Security.WindowsAuthenticationModule"/> <add name="FormsAuthentication" type="System.Web.Security.FormsAuthenticationModule"/> ... </httpModules>

Here s an example: Protected Sub sourceEmployees_Selected(ByVal sender As Object, ByVal e As SqlDataSourceStatusEventArgs) If eException IsNot Nothing Then ' Mask the error with a generic message (for security purposes) lblErrorText = "An exception occurred performing the query" ' Consider the error handled eExceptionHandled = True End If End Sub.

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One of the benefits of HTTP modules and HTTP handlers is that they provide an extensible architecture that allows you to easily plug in your own handlers and modules. In the past, developers who needed these sort of features were forced to author their own ISAPI extensions (which play the same role as HTTP handlers) or ISAPI filters (which play the same role as HTTP modules). Both of these components are dramatically more complex to create.

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change to the same employee record. However, that update command not only applies the new name, but it also overwrites every field with the values in Chen s page effectively replacing the address Lucy entered with the old address. To defend against this sort of problem, you can enforce stricter concurrency checking. One way to do this is to create a command that performs the update only if every field matches. Here s what that command would look like: UpdateCommand="UPDATE Employees SET FirstName=@FirstName, LastName=@LastName, Title=@Title, City=@City FROM Employees WHERE EmployeeID=@original_EmployeeID AND FirstName=@original_FirstName AND LastName=@original_LastName AND Title=@original_Title AND City=@original_City"> The problem is that the command doesn t have access to the original values of every field instead, it has only the original value of any key fields. You could define every field in the table as a key field, but this is certain to cause confusion. A better solution is to set the SqlDataSource.ConflictDetection property to ConflictOptions.CompareAllValues instead of ConflictOptions.OverwriteChanges (the default). The data control will then supply the original value of every field, and the command will work as written. At the end of 10 you'll see an example that shows how you can implement a more sophisticated concurrency handling strategy that warns you when a change will conflict, and gives you the option of applying it or canceling it.

Selecting data is only half of the equation. The SqlDataSource can also apply changes. The only catch is that not all controls support updating. For example, the humble ListBox doesn t provide any way for the user to edit values, delete existing items, or insert new ones. Fortunately, ASP.NET s rich data controls including the GridView, DetailsView, and FormView all have editing features that you can switch on. The first step is to define suitable commands for the operations you want to perform, such as inserting (InsertQuery), deleting (DeleteQuery), and updating (UpdateQuery). If you know that you will allow the user to perform only certain operations (such as updates) but not others (such as insertions and deletions), you can safely omit the commands you don t need. You define the InsertCommand, DeleteCommand, and UpdateCommand in the same way you define the command for the SelectCommand property by using a parameterized query. For example, here s a SqlDataSource that defines a basic update command that updates every field:

ISAPI extensions and filters plug directly into IIS. HTTP handlers and modules play the same role, but they plug into ASP.NET. For example, imagine you create and register a custom HTTP handler. When the client issues a request for that file type, it will flow first from IIS to ASP.NET (through the ASP.NET ISAPI extension). Then ASP.NET will create and execute your handler. As a result, your handlers and modules never interact with IIS.