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System.IO.StreamWriter::.ctor(class [mscorlib]System.IO.Stream) box Convert value type to object reference This instruction forces a value into an object and leaves the object on the stack when the conversion is done. When boxing, this instruction does the work. You will see the following code a lot when passing parameters: // Notice the value type INT32 is passed to this method. .method public hidebysig specialname instance void { ldstr ldarga.s the box "Indent" 'value' // Push the method name. // Load the argument address of // first parameter. [mscorlib]System.Int32 // Convert the address into an // object. // Load the message. ldstr "The Indent property must be non-negative." // Create a new ArgumentOutOfRangeException newobj instance [mscorlib]System.ArgumentOutOfRangeException:: .ctor(class System.String, class System.Object, class System.String) unbox Convert boxed value type to its raw form This instruction returns a managed reference to the value type in the boxed form. The returned reference isn't a copy but rather the actual object state. With C# and Visual Basic .NET compiled code, after an unbox instruction comes the ldind instruction (load value indirect onto the stack) or ldobj (copy value type to the stack). // Convert the value into a System.Reflection.Emit.LocalToken unbox System.Reflection.Emit.LocalToken // Get the value onto the stack ldobj System.Reflection.Emit.LocalToken unbox [mscorlib]System.Int16 Int16 // object ldind.i2 the // Put the object's value onto // stack. call Call a method 235 // Convert the value to an void set_Indent(int32 'value') il managed

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With the CLEAR BUFFER command, you can empty the SQL buffer in SQL*Plus. This is something you won t need to do too often, because the SQL buffer is overwritten each time by consecutive commands. With the CLEAR SCREEN command, you can start at the top of a new, empty SQL*Plus screen.

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Identify the user as being unsupported server-side based on the HTTP request Identify the user as being unsupported client-side based on navigator.userAgent

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Suppose you need to determine the number of days per month (forgetting about leap year, for the sake of argument). A clumsy way to do it, of course, is to write a large if statement.

With the Downloader object, you can access network resources from JavaScript. Please note that this object works only if you are running the Silverlight application from a Web server, and it will throw an error if you are simply loading the page from the file system. You create a Downloader object using the createObject method provided by the Silverlight control. Here s an example:

Request Control allows (with the novice s consent) the expert to take control of the novice s computer. For details, see the following section, Taking Control of the Novice s Computer. While the expert has control, each party s toolbar has a Stop Sharing button, with which either user can return exclusive control to the novice. Clicking Fit To Screen toggles the expert s view of the novice s screen between actual-size and a scaled view that fits in the Remote Assistance window without the use of scroll bars. The Settings button appears on the Remote Assistance toolbar for both users, but it summons a different set of options, as shown in Figure 9-11. For details about these settings, see the following sections, Taking Control of the Novice s Computer and Improving Remote Assistance Performance.

MBR objects can configure their own leases by overriding the InitializeLifetimeService method. The following fragment demonstrates increasing the RenewOnCallTime to 5 minutes and the InitialLeaseTime to 1 hour:

---------------------------------------------------------------------- Function: fn_subordinates1, Descendants --- Input : @root INT: Manager id --- Output : @Subs Table: id and level of subordinates of -input manager (empid = @root) in all levels --- Process : * Insert into @Subs row of input manager -* In a loop, while previous insert loaded more than 0 rows -insert into @Subs next level of subordinates --------------------------------------------------------------------USE tempdb; GO IF OBJECT_ID('dbo.fn_subordinates1') IS NOT NULL DROP FUNCTION dbo.fn_subordinates1; GO CREATE FUNCTION dbo.fn_subordinates1(@root AS INT) RETURNS @Subs TABLE ( empid INT NOT NULL PRIMARY KEY NONCLUSTERED, lvl INT NOT NULL, UNIQUE CLUSTERED(lvl, empid) -- Index will be used to filter level ) AS BEGIN DECLARE @lvl AS INT; SET @lvl = 0; -- Initialize level counter with 0 -- Insert root node into @Subs INSERT INTO @Subs(empid, lvl) SELECT empid, @lvl FROM dbo.Employees WHERE empid = @root; WHILE @@rowcount > 0 BEGIN SET @lvl = @lvl + 1; -- while previous level had rows -- Increment level counter

Listing 9-27. Listing employee current and previous salaries SELECT , , , , FROM ORDER BY EMPNO ----7369 7369 7499 7499 7499 7499 7499 empno begindate enddate msal LAG(msal) OVER (PARTITION BY empno ORDER BY begindate) prev_sal history empno, begindate; ENDDATE MSAL PREV_SAL --------- ------ -------01-FEB-00 950 800 950 01-JUL-89 1000 01-DEC-93 1300 1000 01-OCT-95 1500 1300 01-NOV-99 1700 1500 1600 1700