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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.

Using Visual Basic to Create PDFs from Images

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.

Visual Basic Guide

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. However, these are default names for a command button in Visual Basic 6 and VB.

NET respectively. In VB. There is a function called MessageBox. Show in the Microsoft. VisualBasic namespace which can be used instead of MsgBox similarly to the corresponding function in Visual Basic 6. There is a controversy [9] about which function to use as a best practice not only restricted to showing message boxes but also regarding other features of the Microsoft.

VisualBasic namespace. Some programmers prefer to do things "the. NET way", since the Framework classes have more features and are less language-specific.

Others argue that using language-specific features makes code more readable for example, using int C or Integer VB. NET instead of System. The following example demonstrates a difference between Visual Basic 6 and VB. Both examples close the active window. Click Close End Sub The 'cmd' prefix is replaced by the 'btn' prefix, conforming to the new convention previously mentioned. Setting Up Your Form First, you create the sample application and form.

There should now be two forms in your project, which is exactly what you want because we will launch the GetAddress dialog box from Form1. Now, you need to set up the look of GetAddress to match the expected appearance of a dialog box.

Set up four text boxes named txtStreet, txtCity, txtPostalCode, and txtCountry on your form and arrange them somewhat like the form shown in Figure 3. Now, add two buttons to your form, saveAddress and cancelAddress, with captions of OK and Cancel, respectively.

The two buttons should be positioned in the lower-right corner.

Visual Basic .NET

If you are planning to make your dialog box resizable, you will want to anchor the two buttons to bottom and right. Select the form itself click any empty area of the design surface and set its AcceptButton and CancelButton properties to the saveAddress and cancelAddress buttons. Setting these properties allows the users to use the Enter and Escape keys as the equivalent of OK and Cancel.

The AcceptButton property also makes the saveAddress button into the default for the form, which causes it to be highlighted. So that you can tell what button was pressed to exit the form, you should also set the DialogResult property of both buttons. If you want your dialog box to be resizable, select the Sizable option for the FormBorderStyle property. Once you have created your dialog box, the key to using it is to determine a method for putting starting data into the dialog box and for pulling out the information the user entered.

You could access the various controls the text boxes directly, but I strongly advise against it.

If you work directly with the controls, you will have to change that code if you ever modify the dialog box. Instead, I suggest one of two approaches. Either create a property procedure for each of the values you are exchanging street, city, postal code, and country in this example or create a new class that holds all of these values and then create a single property for that object.

This section shows you both methods; you can use whichever one you prefer.

For the first case, using multiple properties, create a property for each of the four values you are dealing with, as shown in Listing 3. The value in using property procedures instead of direct control access is that you can change these procedures later, without affecting the code that calls this dialog box. The properties are all set up now, but to make the dialog box work correctly, you also need some code shown in Listing 3.

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Click Me. There are also a number of open-source systems available. You could also use the Word or Visio object libraries to read and write PDF files but using these large systems for just this one thing will require extra programming, also has license issues, and will make your program bigger than it has to be. Just as you need to download Office before you can take advantage of Word, you also have to download the full version of Acrobat before you can take advantage of more than just the Reader.

You would use the full Acrobat product in about the same way that other object libraries, like Word above, are used. I don't happen to have the full Acrobat product installed so I couldn't provide any tested examples here. NET Toolbox. 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

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