This chapter provides information on how to use the Microsoft .NET platform to create a SOAP Web services application.

Note. NetSuite recommends that you use Visual Studio .NET when you create an application using Microsoft .NET because it provides an integrated development environment for creating and debugging Web services applications. Instead, you can download and install the Microsoft .NET Framework SDK. However, this only provides an SDK and NOT an integrated IDE.

All the code samples in this chapter use C#, but the steps are similar for all other languages supported by Microsoft .NET. These languages include Visual Basic, Visual J#, and C++.

Step 1
Install Microsoft Visual Studio .NET, which includes .NET Framework 4 or higher.

Step 2
Run Microsoft Visual Studio .NET.

Step 3
Create a new project and select a template.
For example: the console program shown in the figure below.

Step 4
After creating the project, add a web link.
Go to the Project menu -> Add service link -> click the Advanced button.
Click the “Add web link” button.

Step 5
In the Add Web Reference message, enter the SuiteTalk WSDL URL and click the Go icon.

Step 6
Visual Studio parses the WSDL and then displays a summary of the available operations. If any security warnings are displayed, click Yes as many times as necessary to continue with the process.

Step 7
Once the summary is displayed, click the “Add References” button to create the classes. Once this process is complete, com.netsuite.webservices will be listed under the Web Links section in the Solution Explorer.

Step 8
You can view all the generated proxy classes by doing one of the following:
Option 1: Enable the “Show all files” option in the Project menu.
Option 2: Select View in Object Browser by right-clicking the com.netsuite.webservices listing in the Solution Explorer if the first option is not available.

Step 9
Implement your application by applying your business logic using the .NET proxy classes you created.
Allow the use of objects from the newly created namespace without the need to qualify them.
Create an instance of a NetSuiteService class object.
Enable support for managing multiple cookies.
Create a valid session by populating the Passport object.
Implement your business logic (for example, create a new customer in NetSuite).
Log out to invalidate the current session.

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Customize VS Code for .NET development

Installing extensions
If you are already a VS Code user, you can add .NET support by installing the C# Dev Kit extension. The C# Dev Kit provides a productive and reliable C# experience in VS Code by making it easier to do C# or multilingual development in VS Code. This extension package consists of a set of VS Code extensions that work together to provide a rich C# editing experience, AI-powered development, solution management, and integrated testing experience. As shown in the figure below, the C# Dev Kit consists of:

A C# extension that provides support for the underlying language services, and continues to operate and support it independently of these efforts.
The C# Dev Kit extension, which is based on the same framework as Visual Studio and provides solution management, templates, and test detection/debugging.
The IntelliCode extension for C# Dev Kit (optional), which provides the editor with AI-based development capabilities.

If your projects require F# support, you can also download the .NET Extension Pack, which contains such extensions:

• C# Dev Kit for Visual Studio code
• Ionid for F#
• Jupyter notebooks
• Polyglot Notebooks

You can also install the extensions individually.

.NET Coding Pack for students
To help you get up and running quickly, you can install the .NET Coding Pack, which includes VS Code, the .NET Software Development Kit, and the major .NET extensions. The Coding Pack can be used as a clean install or to upgrade or repair an existing development environment.

Installing the .NET Software Development Kit

If you download the extensions separately, make sure that your local environment also has the .NET SDK. The .NET SDK is a software development environment used to develop .NET applications.

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• Common Language Runtime (CLR)
• Framework-based classes
• User interface program (ASP.NET and Winforms)
• CLR.

We can say that the CLR is the heart and soul of the .NET Framework. As the name suggests, the CLR provides the runtime environment in which programs written in C# and other .NET languages are executed. It also supports cross-language compatibility.

The CLR supports a number of the following services:

• Loading and executing a program
• Memory isolation for a program
• Type safety checking
• Compile IL into your own executable code
• Providing metadata
• Memory management (automatic garbage collection)
• Providing security
• Manage errors and exceptions
• Support for tasks such as debugging and profiling
• Interaction with other systems
• Common type system (CTS)

The .NET Framework provides support for multiple languages through features known as the Common Type System built into the CLR. CTS supports a variety of types and operations that can be found in most programming languages, so calling one language from another does not require type conversion. We can create a .NET application in several other languages, including C++ and Visual Basic.

Common Language Specification (CLS)

The CLS specification defines a set of rules that enable interoperability on the .NET platform. These rules guide third-party compiler developers and library developers. CLS is a subset of CTS, and therefore a language that supports CLS can use the class libraries of others as if they were its own.

Microsoft Intermediate Language (MSIL)

MSIL, simply called IL, is the instruction set that all .NET programs are compiled into. It is similar to assembly language and contains instructions for loading, saving, initializing, and calling methods. When we compile a C# program or any other program written in a CLS-compatible language, the code is compiled into MSIL.

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The RCW and CCW wrappers act as a proxy between unmanaged COM code and managed .NET code. The wrappers marshal method arguments and return method values whenever the client and server have different representations of the data being passed between them.

A CCW is an unmanaged COM object. It is not garbage collected and is destroyed when the last client reference is released. After a CCW is destroyed, the managed object it wraps is also marked for garbage collection. Some of the tasks that a CCW is responsible for when a COM component references a managed .NET component include

• Managing the lifetime of the .NET component
• Creating and binding to the managed object
• Converting .NET exceptions to COM HRESULT values
• Synthesizing multiple COM interfaces (IUnknown, IDispatch, etc.) based on object type information
• Marshaling and data translation between environments

RCW is a managed object and therefore the CLR collects garbage. Some of its responsibilities include

• Managing the lifetime of a packaged COM object
• Creating and binding to the main COM object
• Broadcasting and marshaling data between environments
• Using COM interfaces and factorizing interfaces into a manageable form
• Convert COM HRESULT values to .NET exceptions

To reference a method in a managed class from a COM client, you must first create a COM type library for the managed object and then register it. There are several ways you can accomplish this in .NET. You can run the type library export command line utility tlbexp.exe to create a COM type library. However, this will only create the type library; it will not register it. You can also run the regasm.exe command-line utility. This utility creates the type library and automatically registers it for you. Finally, you can configure Visual Studio .NET to do both tasks automatically at creation time by setting attributes on the managed class’s properties page.

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Step 1: Find and define the use case
To start implementing AI and ML, firstly, you have to define the purpose and goal of the project. It will offer you a clear picture of the appropriate use case for your .NET application. For example, you will know if you need ML or AI to implement chatbots, virtual assistants, image processing, decision making, automation, or anything else.

Step 2: Collect relevant data from multiple sources
A machine learning algorithm needs to be trained before it can be deployed in the real world. So, you have to collect and organize a wide range of data sets for your ML program. Also, check the facts and all other information presented in the datasets for relevance, timeliness, and accuracy.

Step 3. Select an ML and AI library
Choose the appropriate .NET-compatible ML and AI framework, toolkit, or library for your use case. ONNX, TensorFlow, ML.NET, PyTorch, and CNTK are the most popular libraries/frameworks preferred by most .NET developers. However, before choosing any of them, make sure you have all the hardware and software resources to prevent problems.

Step 4: Developing the application and training the model
After choosing a library or framework, start training your AI or ML model. During training, provide a huge amount of input data for the models and save their results. Also, check the results and update the data if necessary to get the expected predictions.

Furthermore, develop the .NET application, test it on different devices, and make sure it works as required.

Step 5: Integrate the .NET application and ML/AI model
Once your AI/ML model is trained and you have the expected results, integrate it into your .NET application. Through the appropriate API (application programming interface), you can easily establish a connection between the AI/ML model and the .NET software.

Also, check compatibility, overall functioning, and performance before deployment.

Step 6: Ongoing monitoring, updates, and training
After deploying your .NET application, keep an eye on its health, performance, and speed. And if you find any bugs or loopholes, fix them before you go live. Also, populate your model with new data frequently to keep it up-to-date and get better results.

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If you’ve ever tried to build a web application, you’re painfully aware of the complexities associated with tiered, stateless web development. Creating these types of web applications, while not rocket science, has been and continues to be time-consuming and tedious with traditional development tools. Microsoft .NET is Microsoft’s next-generation development platform designed to make developing standards-based and Win32 web applications much easier for the developer. It is a radically new way of looking at code development that allows developers to create applications that can exchange data using both traditional and standards-based transport protocols. Some of the new enhancements include the .NET Framework, Common Language Runtime (CLR), Web Services, ASP.NET, and ADO.NET. Visual Studio.

It is now obvious that .NET introduces many new features, including new form factors such as Web Forms and Win Forms, and new technologies such as Web Services and ADO.NET, the next version of ADO. In fact, there are so many new enhancements that it is impossible to cover them all. Therefore, we are going to narrow our focus to the concepts needed to create a managed component. Specifically, this chapter introduces the Common Language Runtime (CLR), .NET Framework, and .NET COM+ services, now known as .NET Enterprise Services.

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