c# validate gtin Implement events in remoting. in C#.NET

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Implement events in remoting.
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Lessons in this chapter:
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Lesson 1: Calling Remoting Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303 Lesson 2: Callbacks and Remoting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319 Lesson 3: Implementing and Responding to Events . . . . . . . . . . . . . . . . . . . . 336
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8
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Method Invocations and Event Management with .NET Remoting
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Before You Begin
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To complete the lessons in this chapter, you must have
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A computer that meets or exceeds the minimum hardware requirements listed in the Introduction at the beginning of the book. Microsoft Visual Studio 2005 and the .NET Framework 2.0. Successfully completed all lessons in s 1 through 6.
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You should be familiar with Microsoft Visual Basic or C# and be comfortable with the following tasks:
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Creating a console application in Visual Studio using Visual Basic or C#. Adding references to system class libraries to a project. Adding a simple Web reference to a project. A basic understanding of remoting methodologies (XML Web services, DCOM, .NET remoting, CORBA, and so on). A familiarity with formatters and serialization in the .NET Framework.
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Ensure that a server application is running before attempting to use client code samples.
NOTE
The server project for each exercise, included on the companion CD, must be running for the processes to work correctly.
Real World
William Ryan A few years ago, my company implemented a fairly straightforward client/server application in ASP.NET. The application was implemented and customers were happy, but we received some new security guidelines from the government that involved implementing a new firewall. The application connected directly to the database from the Web server, which forced us to poke a hole in the firewall and opened up some potential security concerns. We decided that we should use .NET remoting to implement an application server. The Web server would only talk to the application server and the application server would talk to the database. This way, the database could never be accessed directly from the Web server, so even if the Web server were ever compromised, the attack surface would be greatly reduced. This solution was the single best enhancement that was made in the application, and we have used .NET remoting extensively since then.
Lesson 1: Calling Remoting Methods
Lesson 1: Calling Remoting Methods
On the surface, calling a method using .NET remoting might not look any different from calling any other traditional method. However, looks are very deceiving in this case because the mechanics of calling a remote method differ greatly (and for the most part, these mechanics are hidden from the developer) from traditional method invoca tion or even Web method invocation. The following are some of the major differences:
Each time you call a remote method, the server must be contacted so it can pro cess the request. With the exception of methods decorated with the OneWay attribute (discussed later), the developer cannot know at the time of invocation whether or not the method will complete successfully. Much more care must be taken with respect to the passing of parameters and the size of the returned value because remoting methods involve network traffic and, depending on bandwidth availability, operations that would otherwise be trivial might cause performance concerns.
These issues are quite serious and need to be considered in depth before using .NET remoting. For instance, assume that your application had a Person object with a FirstName and LastName property, both of which are of type String. Provided that the prop erties were set properly, each could be referenced from calling code without any possibility of an exception being thrown. Yet if the object was remote, several factors, such as a server failure, would cause the method to fail. Similarly, on client machines, developers often take copious amounts of random access memory (RAM) on client machines for granted. Passing large objects around often makes sense, and most peo ple take the ability to do so for granted. However, in remoting scenarios, each param eter that is passed in, as well as each value that is returned, consumes bandwidth. This bandwidth might not be readily available, and things that used to work fine might suddenly start performing sluggishly (or worse, failing).
After this lesson, you will be able to:
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