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If your program includes frequent references to the members of a namespace, having to specify the namespace each time you need to refer to a member quickly becomes tedious The using directive alleviates this problem Throughout this book, you have been using it to bring the C# System namespace into view, so you are already familiar with it As you would expect, using can also be employed to bring namespaces that you create into view There are two forms of the using directive The first is shown here: using name; Here, name specifies the name of the namespace you want to access This is the form of using that you have already seen All of the members defined within the specified namespace are brought into view and can be used without qualification A using directive must be specified at the top of each file, prior to any other declarations, or at the start of a namespace body The following program reworks the counter example to show how you can employ using to bring a namespace that you create into view:

// Demonstrate the using directive using System;

Using the same pop-up menu, you can also select Drill By to explore data by other dimensions that exist in the document or microcube but that are not currently displayed in the report The Drill By objects are sorted from biggest to smallest within the hierarchy (Year to Month for the Time hierarchy or Product Lines to SKU in the Product hierarchy) In the preceding pop-up menu, Product Line would be an additional column of information that one can Drill By without generating a new query Selecting Drill By to Quarter produces the

Part I:

(tm + 470 )

// Bring Counter into view using Counter; // Declare a namespace for counters namespace Counter { // A simple countdown counter class CountDown { int val; public CountDown(int n) { val = n; } public void Reset(int n) { val = n; } public int Count() { if(val > 0) return val--; else return 0; } } } class NSDemo3 { static void Main() { // now, CountDown can be used directly CountDown cd1 = new CountDown(10); int i; do { i = cd1Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); CountDown cd2 = new CountDown(20); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); cd2Reset(4); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); } }

19:

This version of the program contains two important changes The first is this using statement, near the top of the program:

= g( R)

16:

same results as drilling down from Year to Quarter However, setting Drill By to a dimension not yet in the report, such as Product Line, creates an entirely new perspective on the data Web Intelligence will automatically move the current column to the Drill toolbar and replace it with the Drill By column The Drill By is contextual and becomes more powerful when more details and columns of data are available in the microcube but not displayed in the report For this reason, many BusinessObjects deployments involve report authors creating ever larger microcubes (micro would not be an appropriate term here!), in an attempt to predict report consumers drill paths This is a bad practice The multidimensional analysis in Web Intelligence is not a replacement for an industrial-strength OLAP database such as Microsoft Analysis Services or Hyperion Essbase (see 14 for further discussion on this topic) You want your initial report to contain only a minimal amount of data for response time and scalability reasons If a certain dimension does not appear in the Drill By, users can still access it via Add Drill Filter or Scope Of Analysis The universe may contain still more columns by which to explore the data; however, if they do not exist in the local document, Drill By does not display them Scope Of Analysis and Drill Through do

using Counter;

(tm + 470 )

This brings the Counter namespace into view The second change is that it is no longer necessary to qualify CountDown with Counter, as this statement in Main( ) shows: