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VB.NET development features 1. Data access:

The main differences are as follows: data access technology, specific implementation methods of data access and data binding.

In terms of data access technology, Visual Basic 6.0implements database access through ADO (Active X Data Object, Active X data object). At the same time, in order to ensure the compatibility with earlier versions, two data access technologies, RDO (remote data object) and DAO (data access object), are also provided. In Visual Basic .net, ADO.NET is used to access the database. ADO.NET is part of the .NET Framework, and its corresponding class library is a true subset of .net FramWork SDK. There are many differences in concept, function, and implementation between ADO and ADO.NET. Due to the limitation of space, we will not introduce them one by one here.

In fact, you can also use ADO to access the database in Visual Basic .net, but ADO appears as a COM component in Visual Basic .net and can only be used in Visual Basic .net by adding references. The process of adding a reference is actually interoperable with COM components. The interoperable COM components are no longer COM components in the previous sense, but have been transformed into .net class libraries that can be directly used by Visual Basic .net.

In terms of the specific implementation methods of data access, there are mainly two methods to realize data access by Visual Basic 6.0. one is that in the program design stage, the data source can be bound to ADODC controls or use the data environment, and the other is that at run time, you can create recordset RecordSet objects and exchange data with recordset objects.

Similarly, there are two main methods to realize data access in Visual Basic .net: one is to create and configure the data adapter DataAdapter and generate the data set DataSet; in the program design stage, and the other is to dynamically create and configure the data adapter and create and generate the data set by programming.

On Data Bind, data binding is implemented in Visual Basic 6.0by setting the following properties of the control: DataChanged, DataField, DataFormat, DataMember and DataSource. Typically, you bind the display properties of the control to the corresponding fields in the data source. Data binding can be used much more widely in Visual Basic .net, and any property of any control can be bound to any structure that contains data in Visual Basic .net.

VB.NET development features 2. Web development:

Visual Basic uses Active Server Page (ASP for short) to create applications in Web. In ASP, writing Web pages is not a pure Visual Basic language, but a Visual Basic scripting language-VBScript. In Visual Basic. Net, ASP.NET technology is used to write Web pages. What is used in ASP.NET is no longer a scripting language, but a real programming language, which can be Visual Basic .net. Friends who have developed ASP pages know that although writing ASP pages faces low requirements of development tools, because they are process-oriented, the slightly more complex ASP code appears disorganized, which brings trouble to program design, debugging and modification.

While Visual Basic. Net is based on the new framework, Visual Basic. Net fully supports Web programming. With ASP.NET 's Web application, XML Web services and other Web-based features, the development of Web pages by Visual Basic. Net is very similar to the development of Windows programming, and the code of Web pages is not organized.

VB.NET development features 3. Component creation:

When writing an application using Visual Basic 6.0and Visual Basic .net, although you can add components to the application by selecting components from the toolbox and dragging them in, the implementation mechanisms of the two are fundamentally different. In Visual Basic 6.0, the components created in the application are all COM components, that is, ActiveX controls, DLL of type ActiveX and EXE of type ActiveX can be used in COM applications.

In Visual Basic .net, the components dragged into the form are based on inheritance and inherit from the corresponding classes in the SDK provided by the .net framework. After instantiation, the components are added to the design form by adding functionality. These procedures can be found in the source code of Visual Basic .net. Every component used in Visual Basic .net is derived from the Component or Control base class.

Of course, there are still many differences between Visual Basic and Visual Basic. Net, for example, Visual Basic 6.0 only provides single-threaded mode, but does not support multithreading. Multithreading is fully supported in Visual Basic. Net. And new functions such as structured exception handling are added in Visual Basic. Net. So for those Visual Basic programmers, the transition from Visual Basic programmers to Visual Basic. Net is extremely necessary.

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