Math members in C#.NET

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Math members
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Appendix D: The NET Class Library
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In order to select the documentation for the Round() method, simply click on the method in the window shown in Figure D-6, and you will see the screen in Figure D-7 This method is overloaded four times in order to give you an opportunity to pass it different sets of parameters In our previous example, we simply sent the method a double value (1242) However, you could send a decimal and an int, as well as a double and an int This again demonstrates the power of overloading methods you don t have to remember four different method names Notice the signature of all the methods They are all static methods This means that you do not need an instance of the class in order to call the methods As a matter of fact, if you examine the code from our example, you will notice that we simply called the method directly from the class name itself:
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ConsoleWriteLine (MathRound(1242));
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Most of the utility methods in the System class will operate in a similar fashion If you wish to dig deeper into the documentation, you can select any of the links for the overloaded methods We chose the first one to demonstrate:
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public static decimal Round(decimal);
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PART VII
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Figure D-7
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The Round( ) method from the Math class
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As Figure D-8 shows, by selecting the link, you receive valuable information detailing the method Even though we have chosen to look at a relatively easy concept, rounding, you can imagine that if you needed to find out about a method you knew nothing about, the documentation presented here would be worth its weight in gold
A Final Note on the System Namespace
Microsoft has attempted to alleviate some of the confusion that can arise when there are so many different namespaces and classes from which to choose By using the System namespace and then further subdividing it, you really have one focused area in which to start your search You will find that there are a few other top-level namespaces, such as MicrosoftCsharp, MicrosoftJscript, MicrosoftVisualBasic, and so on, that are used to describe classes pertinent to the individual languages However, you will probably spend most of your time in the System namespace Although this is not specific to the System namespace, there is another area of the documentation that may be of interest to you It is possible to view the namespace hierarchy in order to see which classes are base classes and which are derived classes Figure D-9 illustrates the System namespace inheritance scheme You will find a link on each of the namespace home pages that will take you to <<namespace>> hierarchy
Figure D-8
Digging deeper in the Math documentation
Appendix D: The NET Class Library
Figure D-9
The System namespace inheritance hierarchy
Useful System Namespaces
We will now take a brief look at some of the namespaces that might be pertinent to you on the Microsoft exams, in particular, SystemData, SystemWebUI, and SystemWindowsForms You saw SystemData in 10, and the other two were discussed in Parts III and IV on Web and Windows development
SystemData Namespace
You will find in the SystemData namespace a lot of classes that make up part of the ADONET structure This allows you to manipulate data from many different sources ADO follows a concept of universal data access and provides tools to access, update, and connect to data in any location For more information on ADONET, please review 10 on basic data access Table D-2 lists some of the classes found in this namespace There are many classes, interfaces, delegates, and enumerations available within the SystemData namespace For example, in the following list, you will see the inheritance structure of the classes in the SystemData namespace You can use this as a reference PART VII
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Class Purpose
Constraint DataColumn DataException DataRelation DataRow DataSet DataTable Table D-2
Simulates a constraint on one or more DataColumn objects Represents the field level from a table Represents an exception that is thrown from ADONET components Represents the relationship between two DataTable objects Same as DataColumn, except it represents a row of data Represents the powerful, internal cache of data returned Represents one table of in-memory data
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