Building the Business Logic Layer in Visual Studio .NET

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Building the Business Logic Layer
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Public Sub New(ByVal message As String, _ ByVal inner As Exception) MyBaseNew(message, inner) End Sub Public Sub New( _ ByVal info As _ SystemRuntimeSerializationSerializationInfo, _ ByVal context As _ SystemRuntimeSerializationStreamingContext) MyBaseNew(info, context) End Sub End Class
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NOTE: This class was created with the Exception snippet See the next chapter for details on using snippets
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NOTE: The Serializable attribute on this class defines that the exception class can be serialized Serialization is the process of converting an object into a sequence of bytes for either storage or transmission to another location For example, you could serialize an object to a file to save the value of all the object s properties This attribute is added to the exception class to support remoting Remoting is the process of passing an object to another computer by serializing the object If an exception occurs on the remote computer, the exception is serialized and remoted back to the original application For more information on remoting, see the Lhotka book in the Additional Reading section See the SystemRuntimeSerialization NET Framework class documentation for more information on serialization See the later section Obsolescing Methods for more information on attributes
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This class inherits from ApplicationException to ensure that it behaves as an exception It contains three methods, each of which calls the associated base class method Using the same named methods with different parameters is described later, in the section Overloading Methods You can create your own exceptions any time using this style of exception class
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Defining Properties
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NOTE: Although the exception snippet inherits from ApplicationException, best practices define that you should inherit from Exception instead ApplicationException was originally set up for your use, as defined in the preceding example However, it was misused within the NET Framework, so the Framework developers recommend that you do not use ApplicationException in your code (See the Additional Reading section for the reference to the Framework Design Guidelines book containing this recommendation)
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Don t put multiple business object classes in a single class le Reserve this feature for adding support classes or exception classes only For example, business object-unique exceptions are an excellent type of class to add to a business object class le
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5 BUILDING THE BUSINESS LOGIC LAYER
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Defining Properties
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The properties of a class de ne the data associated with the class For example, a Product class has ProductName, ProductID, and InventoryDate properties Each object created from the class can have a different set of values for these properties This section details the process of creating a property It then covers some additional techniques for working with properties
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Creating the Property
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Create a property in a class for each data attribute identi ed for the class during the design phase Following best practices, de ning properties requires two steps First you create a private variable to retain the property value This private variable is called a backing variable or backing eld and retains the property s value You make the variable private so that it cannot be directly accessed by any code outside of the class Next you create a Property statement The Property statement de nes the property and the accessors used to get and set the property The Set accessor, sometimes called the setter, sets the property s value, and the Get accessor, sometimes called the getter, returns the property s value
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Building the Business Logic Layer
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This technique encapsulates the property by providing access to it only through the accessors You can write code in the accessors to validate data, perform formatting, or any other business logic To de ne a property: 1 Open the class in the Code Editor 2 Declare a private variable for the property For example:
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Private _ProductName As String
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By making the variable private, you ensure that code outside of this class can not access the property directly All code must access the variable value through the Property statement Use good naming conventions for your private variable There are several common conventions, such as pre xing the property name with m or m_ to de ne the variable as member-level The convention that is currently gaining popularity is to pre x the property name with an underscore to indicate that the variable should not be used anywhere in the code except in the Property statement 3 Create the Property statement for the property For example:
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