Vb.Net Architecture Pdf

NET Framework and Architecture This article will help your in understanding. NET and. NET architecture. What is the. NET Framework The. NET Framework is a new and revolutionary platform created by Microsoft for developing applications. It is a Framework that supports Multiple Language and Cross language integration. IT has IDE Integrated Development Environment. Framework is a set of utilities or can say building blocks of your application system. NET Framework provides GUI in a GUI manner. Web Services and Application Frameworks. CLR, the C, C, VB. NET. XMLbased Web Services architecture allows programs written in different languages. PHP Software Architecture Projects for 30 5000. Need application developed in VB. NET 2005 which allows a user to scan a document, save the file on disk, and. Traditionally used for desktop graphical user interfaces GUIs, this architecture has become popular for designing web applications and even mobile. KB/aspnet/Creating_PDF_documents_in/081_hello_pdf.jpg' alt='Download Vb Net' title='Download Vb Net' />NET is a platform independent but with help of Mono Compilation System MCS. MCS is a middle level interface. B28NJpJ61hA/TNF1uxEb8DI/AAAAAAAAAOU/eOnxOWB6OLQ/s1600/UserRegistrationform.JPG' alt='Vb.Net Architecture Pdf' title='Vb.Net Architecture Pdf' />NET Framework provides interoperability between languages i. Common Type System CTS. NET Framework also includes the. NET Common Language Runtime CLR, which is responsible for maintaining the execution of all applications developed using the. Image1.jpg' alt='Vb Net Basics' title='Vb Net Basics' />NET library. The. NET Framework consists primarily of a gigantic library of code. Definition A programming infrastructure created by Microsoft for building, deploying, and running applications and services that use. NET technologies, such as desktop applications and Web services. The Microsoft. NET platform using ASP. NET, C, VB. NET, and MS AJAX. Understanding core application architecture and design patterns can be tough for many. ADO. NET architecture. Choosing a DataReader or a DataSet. When you decide whether your application should use a DataReader see Retrieving Data Using a DataReader. Step by step Exercises. ClientServer Software Architecture Web Services APIs 3Tier Architecture API Application Programming Interface. Different devices or software. Display a pdf document in VB. Net app. NET Framework Common Language Runtime Internals and Architecture. I need a way so that when I hit a button on my form, the signature area on the PDF will fill in with a specified signature. The signature I need is based. Cross Language integration. You can use a utility of a language in another language It uses Class Language Integration. NET Framework includes no restriction on the type of applications that are possible. The. NET Framework allows the creation of Windows applications, Web applications, Web services, and lot more. The. NET Framework has been designed so that it can be used from any language, including C, C, Visual Basic, JScript, and even older languages such as COBOL. Difference between Visual Studio and Visual Studio. NETVisual Studio. Visual Studio. It is object based. It is object oriented. Internet based application Web Application Web services Internet enable application Third party API Peer to peer Application. All developing facilities in internet based application. Poor error handling ExceptionError. Advance error handler and debugger. Memory Management System Level Task. Memory Management Application Domain with help of GC Garbage CollectorDLL HELLVS. NET has solved DLL HELL Problem. Simple explanation of definition used in the above comparision Web Application. All websites are example of web application. They use a web server. Internet Enabled Application. They are desktop application. Yahoo messenger is an example of desktop application. Peer to Peer. Communication through computers through some system. Web Services. It doesnt use web based server. Internet payment systems are example of web services. DLL HellDLL Hell refers to the set of problems caused when multiple applications attempt to share a common component like a dynamic link library DLL or a Component Object Model COM class. The reason for this issue was that the version information about the different components of an application was not recorded by the system. Windows Registry cannot support the multiple versions of same COM component this is called the dll hell problem. Net Framework provides operating systems with a Global Assembly Cache GAC. This Cache is a repository for all the. Net components that are shared globally on a particular machine. When a. Net component is installed onto the machine, the Global Assembly Cache looks at its version, its public key, and its language information and creates a strong name for the component. The component is then registered in the repository and indexed by its strong name, so there is no confusion between different versions of the same component, or DLL. Architecture of. NET Framework. Architecture of CLRCLS Common Language SpecificationIt is a subset of CTS. All instruction is in CLS i. CTS is written in CLS. Code Manager. Code manager invokes class loader for execution. NET supports two kind of coding. Managed Code. 2 Unmanaged Code. Managed Code. The resource, which is with in your application domain is, managed code. The resources that are within domain are faster. The code, which is developed in. NET framework, is known as managed code. This code is directly executed by CLR with help of managed code execution. Any language that is written in. NET Framework is managed code. Managed code uses CLR which in turns looks after your applications by managing memory, handling security, allowing cross language debugging, and so on. Unmanaged Code. The code, which is developed outside. NET, Framework is known as unmanaged code. Applications that do not run under the control of the CLR are said to be unmanaged, and certain languages such as C can be used to write such applications, which, for example, access low level functions of the operating system. Background compatibility with code of VB, ASP and COM are examples of unmanaged code. Unmanaged code can be unmanaged source code and unmanaged compile code. Unmanaged code is executed with help of wrapper classes. Wrapper classes are of two types CCW COM callable wrapper and RCW Runtime Callable Wrapper. Wrapper is used to cover difference with the help of CCW and RCW. COM callable wrapper unmanaged code. Runtime Callable Wrapper unmanaged code. Native Code. The code to be executed must be converted into a language that the target operating system understands, known as native code. This conversion is called compiling code, an act that is performed by a compiler. Under the. NET Framework, however, this is a two stage process. With help of MSIL and JIT. MSIL Microsoft Intermediate LanguageIt is language independent code. When you compile code that uses the. NET Framework library, you dont immediately create operating system specific native code. Virtual Dj Skin Full Version there. Instead, you compile your code into Microsoft Intermediate Language MSIL code. The MSIL code is not specific to any operating system or to any language. JIT Just in TimeJust in Time JIT compiler, which compiles MSIL into native code that is specific to the OS and machine architecture being targeted. Only at this point can the OS execute the application. The just in time part of the name reflects the fact that MSIL code is only compiled as, and when, it is needed. In the past, it was often necessary to compile your code into several applications, each of which targeted a specific operating system and CPU architecture. Often, this was a form of optimization. This is now unnecessary, because JIT compilers as their name suggests use MSIL code, which is independent of the machine, operating system, and CPU. Several JIT compilers exist, each targeting a different architecture, and the appropriate one will be used to create the native code required. The beauty of all this is that it requires a lot less work on your part in fact, you can forget about system dependent details and concentrate on the more interesting functionality of your code. JIT are of three types Pre JIT Econo JIT Normal JIT Pre JITIt converts all the code in executable code and it is slow. Econo JITIt will convert the called executable code only. But it will convert code every time when a code is called again. Normal JITIt will only convert the called code and will store in cache so that it will not require converting code again. Normal JIT is fast. Assemblies. When you compile an application, the MSIL code created is stored in an assembly. Assemblies include both executable application files that you can run directly from Windows without the need for any other programs these have a. Realizing a Service Oriented Architecture with. NETMinimize Roundtrips. Fahrenheit Xbox Iso. A design goal should be to design services to minimize round trips. This was true with COM and it continues to be true with. NET and Web Services. Recall in classic n tiered distributed architectures that conventional wisdom said it was better to move 1. We would optimize method signatures and design stateless components, and we would use database helper routines to convert ADO recordsets to XML to provide a lightweight payload for distributed applications. With SOAP and Web Services, we generally see the same approach. However, we need to take it one step further. We should now consider using the Web Service as a service, not just a data pump, and XML as a self describing package, not just a payload. Align Web Methods to Forms. Web methods should be designed to perform an entire service for an entire form. In short, our design goals are. Provide a course grained Web method at the form level. Have the Web method invoke whatever business objects it needs. Return to the consumer the whole service result, like a Data. Set with numerous tables within it. Consider the following example. We may be designing a search form to search a bookstore for certain titles. To support this search screen in this figure, we would design a Web method called Get. Search. Screen. Info which returns a Data. Set that has a number of tables within it. This Web Method is designed to provide all the information the form needs to draw itself on the load event. Figure 5. Align service methods to forms. On this particular form, we need two lists just to populate the screen a list of valid publishers, and a list of valid categories. Rather than making two calls to the Web Service one for each dropdown, we design our Web method to provide everything we need in a single call. We service the loading of the search form in a single interaction. Later work, such as performing the search or drilling into details, is handled by separate Web methods. Behind the scenes, our web method is invoking and managing all the business objects it needs to satisfy the request. Moving Data Between Tiers. Data can be moved between architectural tiers as Data. Sets, serialized objects, raw XML, etc. Data. Sets are. NET specific objects that serialize nicely but are intended for other. NET applications. If your application needs to interoperate with, for example, a J2. EE solution, Data. Sets may be too troublesome to employ because the J2. EE side would not readily understand a Data. Set. Serializing business objects is also an option. But remember that the full object is not marshaled. The objects public properties and data members are serialized and shipped, but the calling client cannot re inflate the object and access its private data members or methods. XML is, of course, an obvious choice also. XML formatted exchanges are a solid and proven technique for moving data around any distributed architecture. Distributed Transactions. Call Of Duty 4 Zombie Mod Bots. Web methods can act as the root of a distributed transaction. These transactions are managed by the Distributed Transaction Coordinator DTC. Our Web Service classes must reference the System. Enterprise. Services namespace, and can then use the Context. Util class to use the Set. Abort and Set. Complete methods. This provides for declarative transaction control. Each object enlisted by the Web method is a child object and will participate in the transaction and vote on the outcome. This provides the best fit for keeping objects granular enough to manage their own data from a persistent store, while still allowing them to be orchestrated by a transaction root controller. Transactional context is managed by the root. Web Methods must be adorned with the Transaction. Option attribute, something like this. Web. MethodTransaction. OptionTransaction. Option. Requires. New. Child objects need nothing special. They do NOT need to derive from the Serviced. Component base class. The same child object can be enlisted in a transaction for one Web method, but not enlisted in a transaction for another Web method. Exception Handling. Exceptions should be considered a rarity. They should be thrown only in exceptional situations, not in normal branching. Each caller should catch exceptions and deal with them appropriately. In its simplest form, an exception could be bubbled up the call stack from the backend to the UI and presented to the end user. However, each step up the stack should have processing done at that layer. All exceptions thrown over SOAP get shipped as SOAP exceptions. For example, we might throw an exception if someone tried to log on inappropriately using this simplified code. Throw New Bad. Password. Exception. The caller would need to catch that exception, like this. Catch x. 1 As Bad. Password. Exception. In this example, the caller catches the particular exception and reacts to it. However, if the Web Service threw an application exception to the end user client, the exception is transformed into a SOAP exception. In fact, the client program must specifically catch that SOAP exception, as in Figure 6. System. Web. Services. Protocols. Soap. Exception. Figure 6. Throwing exceptions over a SOAP connection. The client program must catch at least 3 different types of exceptions. The first is Soap. Exception. On the client, Soap. Exceptions should be caught for any middle tier exceptions. This is useful for throwing exceptions from the middle tier application logic. However, ANY middle tier exceptions will be thrown as a Soap. Exception. We can encode the inner exception to be business problem specific information we need. As an example, we can pass a Soap. Exception with a meaningful message, such as Database access error, so that the client can deal with it. Next the client should catch Web. Exceptions. This is useful when the network goes down in the middle of an end users session. Finally, the client must catch client side exceptions. These are thrown by client side processing, and are something local to client, like File.