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A Vertical Bar and Line chart allows you to have a dual Y-axis This is necessary when you want to graph two different measures that have different scales To change an existing chart style or tabular data set, you can either drag a template onto the existing block or 1 Select the block 2 Right-click and select Turn To from the pop-up menu 3 Choose the new chart type from the Turn To dialog

class Test<T> where T : class {

The class constraint requires that any type argument for T be a reference type In this program, this is necessary because of what occurs inside the Test constructor:

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Part III:

public Test() { // The following statement is legal only // because T is guaranteed to be a reference // type, which can be assigned the value null obj = null; }

Here, obj (which is of type T) is assigned the value null This assignment is valid only for reference types As a general rule, you cannot assign null to a value type (The exception to this rule is the nullable type, which is a special structure type that encapsulates a value type and allows the value null See 20 for details) Therefore, without the constraint, the

Figure 21-13 shows the different chart components If you are used to charting data in either Microsoft Excel or Desktop Intelligence, the quantity sold in Figure 23-13 appears on the second Y-axis However, within Web Intelligence, this is referred to as the Z-axis This distinction is only important if you wish to change the font, scale, or gridlines for this axis To set the formatting for any axis, 1 Select the chart and right-click to call the pop-up menu 2 Select Edit Format 3 Within the Properties tab, expand the Appearance category and the Y-axis 4 To change the scale, set the Min and Max values

18:

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assignment would not have been valid and the compile would have failed This is one case in which the difference between value types and reference types might be important to a generic routine The value type constraint is the complement of the reference type constraint It simply ensures that any type argument is a value type, including a struct or an enum (In this context, a nullable type is not considered a value type) Here is an example:

5 To change the font for the numbers that appear on the Y-axis, expand the Label group and click the ellipse () next to the Label to call the Format Text dialog

// Demonstrate a value type constraint using System; struct MyStruct { // } class MyClass { // } class Test<T> where T : struct { T obj; public Test(T x) { obj = x; } // } class ValueConstraintDemo { static void Main() { // Both of these declarations are legal Test<MyStruct> x = new Test<MyStruct>(new MyStruct()); Test<int> y = new Test<int>(10); // But, the following declaration is illegal! Test<MyClass> z = new Test<MyClass>(new MyClass()); } }

-24221 -36931 -39541 -42043 -44429 -46693 -48830 -50832 -52695 -54414 -55984 -57400 -58659 -59757 -60691 -61459 -62059 -62488 -62746 -62832

In this program, Test is declared as shown here:

21:

class Test<T> where T : struct {

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Because T of Test now has the struct constraint, T can be bound only to value type arguments This means that Test<MyStruct> and Test<int> are valid, but Test<MyClass> is not To prove this, try removing the comment symbols from the start of the last line in the program and recompiling An error will be reported

Also, in Figure 21-13, the chart has a title This title remains associated with the chart and is not a standalone cell 1 To set the chart title from the Properties tab, expand the Appearance category 2 Check the Title box to Yes 3 This adds some new options, Text Format, Background Color, Borders, and Text On the Text line, enter a title for the chart

Part I:

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There is a variation of the base class constraint that allows you to establish a relationship between two type parameters For example, consider the following generic class declaration: