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Visual Basic .NET classes don t have destructor methods. In other words, no method or event in the class fires when the instance is destroyed. This major difference from Visual Basic 6 classes stems from the different approach that the .NET Framework uses to reclaim allocated memory. This is arguably one of the most controversial features of the framework and was discussed for months in forums and newsgroups while the .NET Framework was in beta version.

if (Request.UserHostAddress == "127.0.0.1") { ... }

Before exploring the NET way to deal with object destruction, let s see how Visual Basic 6 objects (and COM objects in general) behave in this respect All COM objects maintain a memory location known as the reference counter An object s reference counter is set to 1 when the object is created and a reference to it is assigned to a vari able; the object s reference counter is incremented by 1 when a reference to the object is assigned to another variable Finally, the object s reference counter is decremented when a variable that points to the object is set to Nothing This mechanism is hidden from Visual Basic developers and is implemented behind the scenes through the AddRef and Release methods of the IUnknown interface, an interface that all COM objects must expose.

Before making changes to configuration files, you should always make a copy of the file to restore settings in case a change you make causes a problem.

You can also use the Request.Headers collection to check for custom headers added only by a particular Web server machine. To add a custom header, you open the Properties dialog box of the application s Internet Information Services (IIS) virtual folder and click the HTTP Headers tab.

More specifically, Visual Basic 6 calls the AddRef method for you when you assign an object reference to a variable with the Set keyword It calls the Release method when you set an object variable to Nothing At any given moment, a COM object s reference counter contains the number of vari ables that are pointing to that specific object When the Release method is called, the object checks whether the reference counter is going to be decreased from 1 to 0, in which case the object knows it is no longer required and can destroy itself (If the object is written in Visual Basic 6, a Class_Terminate event fires at this point) In a sense, a COM object is responsible for its own life.

The <customErrors> section specifies the error-handling policy for an ASP.NET application. By default, when an error occurs on a page, the local host sees the detailed ASP.NET error page,

An erroneous implementation of the AddNew or Release method or an unbalanced number of calls to these methods can be responsible for memory and resource leakage, a serious potential shortcoming in COM applications Besides, managing the reference counter itself and frequently calling the AddRef and Release methods can be a time-consuming process, which has a negative impact on the application s performance..

while remote clients are shown a custom error page or a generic page if no custom page is specified. This policy is controlled through the Mode attribute. The Mode attribute can be set to On, Off, or RemoteOnly, which is the default. If it s set to On, custom error pages are displayed both locally and remotely; if it s set to Off, no special error-handling mechanism is active and all users receive the typical ASP.NET (yellow) error page with the original runtime s or compiler s error message and the stack trace. Custom error pages can be specified in two ways. You can provide a generic error page as well as error-specific pages. A custom error page that is not error-specific can be set through the defaultRedirect attribute of the <customErrors> element. This setting is ignored if the mode is Off.

<customErrors defaultRedirect="Errors/appGenericError.aspx" mode="On"> <error statusCode="404" redirect="Errors/notfound.aspx" /> <error statusCode="500" redirect="Errors/internal.aspx" /> </customErrors>

Part II: