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In Excel, you can protect a file with a password when saving it. You can also password-protect a workbook s structure and windows, as well as its worksheet contents. Applying Excel security features can help prevent accidental errors or deletions, but may not thwart a determined malicious attack. A knowledgeable user can circumvent worksheetand workbook-structure protection by using tools, such as password crackers, that are readily available on the Internet. A strong password on the Excel file, or storing the file in a secure network folder can provide better protection. The Security Policies and Settings in the 2007 Office System article provides detailed coverage of the security settings and privacy options available in Excel, as well as other Office programs: http://technet2.microsoft.com/Office/en-us/library/03d787aa-598d-40a9-87ec31a8ea80e0371033.mspx pf=true. The What s New and What s Changed section, on Page 14, outlines the Trust Center, message bar, and documentation-protection features that are in the user interface in Excel 2007.
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Figure 7-10. Comparing simple root objects (left) and collection root objects (right)
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In typical ASP.NET 2.0 applications, if you do a postback on the web page, the entire page will be rerendered. This causes a blink or a flash in the client or browser. On the server, the postback is detected, which triggers the page life cycle. This ends up raising the specific postback event handler code for the control that caused the postback, and this calls upon the page s event handler. When you use UpdatePanel controls along with a ScriptManager control, you eliminate the need for a full-page refresh. The UpdatePanel control is similar to a ContentPanel control in that it marks out a region on the web page that will automatically be updated when the postback occurs (but without the aforementioned postback behavior on the client). It will instead communicate through the XMLHttpRequest channel in true Ajax style. The page on the server still handles the postback as expected and executes, raising event handlers, and so on, but the final rendering of the page means that only the regions specified in the UpdatePanel control s regions will be created.
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Figure 10-5. CslaDataProvider and CslaDataProviderCommandManager This allows controls such as a button to route the appropriate command to the CslaDataProviderCommandManager, which invokes a method on the CslaDataProvider to do the actual work. For example, this XAML defines a Save button: <Button Command="ApplicationCommands.Save" CommandTarget="{Binding Source={StaticResource Project}, Path=CommandManager, BindsDirectlyToSource=True}" HorizontalAlignment="Left" IsDefault="True">Save</Button>
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When you use BFILEs, you will also be using an Oracle DIRECTORY object. The DIRECTORY object simply maps an operating system directory to a string or a name in the database (providing for portability; you refer to a string in your BFILEs, not an operating system specific file-naming convention). So, as a quick example, let s create a table with a BFILE column, create a DIRECTORY object, and insert a row referencing a file in the file system: ops$tkyte@ORA11GR2> create table t 2 ( id int primary key, 3 os_file bfile 4 ) 5 / Table created. ops$tkyte@ORA11GR2> create or replace directory my_dir as "/tmp/" 2 / Directory created. ops$tkyte@ORA11GR2> insert into t values ( 1, bfilename( "MY_DIR", "test.dbf" ) ); 1 row created. Now the BFILE can be treated as if it were a LOB because it is. For example: ops$tkyte@ORA11GR2> select dbms_lob.getlength(os_file) from t; DBMS_LOB.GETLENGTH(OS_FILE) --------------------------1056768 We can see the file pointed to is 1MB in size. Note that the use of MY_DIR in the INSERT statement was intentional. If we use mixed case or lowercase, we would get the following: ops$tkyte@ORA11GR2> update t set os_file = bfilename( "my_dir", "test.dbf" ); 1 row updated. ops$tkyte@ORA11GR2> select dbms_lob.getlength(os_file) from t; select dbms_lob.getlength(os_file) from t * ERROR at line 1: ORA-22285: non-existent directory or file for GETLENGTH operation ORA-06512: at "SYS.DBMS_LOB", line 566 This example points out that DIRECTORY objects in Oracle are identifiers, and identifiers are stored in uppercase by default. The BFILENAME built-in function accepts a string, and this string s case must match the case of the DIRECTORY object exactly as stored in the data dictionary. So, we must either use uppercase in the BFILENAME function or use quoted identifiers when creating the DIRECTORY object:
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A subclass of DataSourceProvider needs to override the BeginQuery() method, which data binding invokes when it needs the control to create or retrieve an object. This can happen in the following cases: When the WPF form is loaded and IsInitialLoadEnabled is True (the default) When a property of the data provider control is changed (via data binding or code) The BeginQuery() method must honor some properties from the base class. First, it must support the concept of deferred refresh, which allows the UI code to set many properties of the data provider control and have the query run only once after they ve all been set. The IsRefreshDeferred property on the base class controls this. Second, it must support the IsInitialLoadEnabled property. If this property is False, then the first time BeginQuery() is invoked, it must return without doing any work. Finally, the CslaDataProvider control supports an IsAsynchronous property, and if that is True, then the query is run on a background thread. Here s the code: Protected Overrides Sub BeginQuery() If Me.IsRefreshDeferred Then Return End If If _firstRun Then _firstRun = False If Not IsInitialLoadEnabled Then Return End If End If Dim request = New QueryRequest() request.ObjectType = _objectType request.FactoryMethod = _factoryMethod request.FactoryParameters = _factoryParameters request.ManageObjectLifetime = _manageLifetime If IsAsynchronous Then System.Threading.ThreadPool.QueueUserWorkItem(AddressOf DoQuery, request) Else DoQuery(request) End If End Sub
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CHAPTER 29 LINQ TO XML
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CHAPTER 2 SE TTIN G UP DIFFE RENT CA MERA MODE S IN YOUR 3 D WORLD
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The orderby clause takes an expression and returns the result items in order according to the expression. Figure 21-9 shows the syntax of the orderby clause. The optional keywords ascending and descending set the direction of the order. Expression is generally a field of the items. The default ordering of an orderby clause is ascending. You can, however, explicitly set the ordering of the elements to either ascending or descending, using the ascending and descending keywords. There can be any number of orderby clauses, and they must be separated by commas.
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MORE ABOUT CLASSES
We will not be utilizing an auto login wallet nor implementing the HSM in this book; just the wallet released by the DBA using a password will be demonstrated. The other approaches will not materially affect the discussions on how the encrypted data is stored and processed or what impact this will have on your applications performance profile.
Figure 6-6. Name and color the Rectangle. Now you should have something like I have in Figure 6-7.
PMON: The Process Monitor
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