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The program calls the Console method WriteLine, which causes the string passed to it to be displayed on the console. Instead of Console. WriteLine, one could use MsgBox, which prints the message in a dialog box instead of a command-line window. Do Until Integer.
ReadLine with a version which takes a prompt string. NET should be considered as just another version of Visual Basic or a completely different language is a topic of debate.
There are new additions to support new features, such as structured exception handling and short-circuited expressions. Also, two important data-type changes occurred with the move to VB.
NET: compared to Visual Basic 6, the Integer data type has been doubled in length from 16 bits to 32 bits, and the Long data type has been doubled in length from 32 bits to 64 bits. This is true for all versions of VB. A bit integer in all versions of VB. NET is now known as a Short. Similarly, the Windows Forms editor is very similar in style and function to the Visual Basic form editor. The things that have changed significantly are the semantics—from those of an object-based programming language running on a deterministic , reference-counted engine based on COM to a fully object-oriented language backed by the.
NET Framework , which consists of a combination of the Common Language Runtime a virtual machine using generational garbage collection and a just-in-time compilation engine and a far larger class library.
The increased breadth of the latter is also a problem that VB developers have to deal with when coming to the language, although this is somewhat addressed by the My feature in Visual Studio The changes have altered many underlying assumptions about the "right" thing to do with respect to performance and maintainability. Some functions and libraries no longer exist; others are available, but not as efficient as the "native". NET alternatives.
Even if they compile, most converted Visual Basic 6 applications will require some level of refactoring to take full advantage of the new language. Documentation is available to cover changes in the syntax, debugging applications, deployment and terminology. NET syntax.
They assume that the developer has created a form, placed a button on it and has associated the subroutines demonstrated in each example with the click event handler of the mentioned button. Each example creates a "Hello, World" message box after the button on the form is clicked. NET automatically generate the Sub and End Sub statements when the corresponding button is double-clicked in design view.
The developer need only add the statement to display the "Hello, World" message box. All procedure calls must be made with parentheses in VB.
NET, whereas in Visual Basic 6 there were different conventions for functions parentheses required and subs no parentheses allowed, unless called using the keyword Call. The names Command1 and Button1 are not obligatory. It will do the job for free.
To use the Reader control, first make sure that you have downloaded and installed the free Acrobat Reader from Adobe. Step 2 is to add the control to the VB. Open VB. NET and start a standard Windows application. Microsoft's "next generation" of presentation, WPF, doesn't work with this control yet.
To do that, right-click on any tab such as "Common Controls" and select "Choose Items Now just drag the control to your Windows Form in the design window and size it appropriately. For this quick example, I'm not going to add any other logic, but the control has lots of flexibility that I'll tell you how to find out about later.
To do that, add this code to the form Load event procedure: Console. I displayed the result of the call in the Output windows only to show how that works.
Here's the result: Click Here to display the illustration Click the Back button on your browser to return If you want to control the Reader, there are methods and properties for that in the control too.
But the good folks at Adobe have done a better job than I could.
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