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How do we handle updating our PivotTable data when the data does not sit in a DBMS If the data on Sheet1 in our example is modified, how do we refresh the PivotTable When we created our macro to build the PivotTable, we assigned a dedicated range of data to the PivotTable using the ActiveCell.CurrentRegion property. The Refresh command cannot recalculate the CurrentRegion property we used because it knows nothing about it. So when we apply the Refresh command, whether through Excel s UI or via VBA code, it only refreshes the data range we initially supplied. Any values that have changed within that range (or any deleted rows) would be updated, but any additions to the data would not be applied to the PivotTable. To update the PivotTable report we created, we will write a subroutine that determines the original data range of the PivotTable and uses that to recalculate the current data range. It will then apply that data range to the PivotTable s SourceData property, and then refresh the PivotTable. In the VBE, create a new subroutine and name it RefreshPivotTableFromWorksheet. Add the following code: Sub Dim Dim Dim RefreshPivotTableFromWorksheet() sData As String iWhere As Integer rngData As Range

The previous chapter introduced you to Windows Presentation Foundation (WPF), a brand-new GUI toolkit that unifies various desktop-centric programming models under a single API. Similarly, Windows Communication Foundation (WCF) is a brand-new distributed computing toolkit that integrates a number of existing distributed technologies (COM+, .NET remoting, XML web services, and Microsoft Message Queuing service [MSMQ]) into a streamlined API. The motivation for doing so is not due to the fact that the previously mentioned technologies cannot be used successfully within .NET development; rather, it s due to the fact that each API solves specific problems of distributed computing instead of offering a single solution. For example, the .NET remoting layer (examined in 18) allows multiple computers to distribute types, provided they are all built using the .NET Framework. MSMQ (a Microsoft technology used to build applications that communicate with intermittently connected applications) works very well, provided each machine is from the Windows operating system family. XML web services (see 25) does allow for interoperability of various operating systems and programming architectures, but if each software agent does not agree upon the same standards, data exchange is limited.

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While we re at it, we ll show you how to make a nice apple crumble for dessert OK, we lied about that last part Let s move on ..

Now consider the use of the C# ref parameter modifier. Reference parameters are necessary when you wish to allow a method to operate on (and usually change the values of ) various data points declared in the caller s scope (such as a sorting or swapping routine). Note the distinction between output and reference parameters:

Output parameters do not need to be initialized before they passed to the method. The reason for this The method must assign output parameters before exiting. Reference parameters must be initialized before they are passed to the method. The reason for this You are passing a reference to an existing variable. If you don t assign it to an initial value, that would be the equivalent of operating on an unassigned local variable. Let s check out the use of the ref keyword by way of a method that swaps two strings: // Reference parameter. public static void SwapStrings(ref string s1, ref string s2) { string tempStr = s1; s1 = s2; s2 = tempStr; } This method can be called as so: static void Main(string[] args) { string s = "First string"; string s2 = "My other string"; Console.WriteLine("Before: {0}, {1} ", s, s2); SwapStrings(ref s, ref s2); Console.WriteLine("After: {0}, {1} ", s, s2); } Here, the caller has assigned an initial value to local string data (s and s2). Once the call to SwapStrings() returns, s now contains the value "My other string", while s2 reports the value "First string".

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