New Features in Visual Basic 9.0

Will the New Additions to Visual Basic Help Regain Lost Ground?

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LANGUAGES: C#

ASP.NET VERSIONS: 2.0

 

New Features in Visual Basic 9.0

Will the New Additions to Visual Basic Help Regain Lost Ground?

 

By Joydip Kanjilal

 

Visual Basic has been one of the most popular programming languages to date. Granted, it was losing its popularity and was about to fade off. But just when it seemed that it was the end of the road for one of the most popular programming languages ever, Microsoft has put in a host of new features in Visual Basic 9.0, which ships with VS.NET 2008. MSDN states, Visual Basic has always centered on building pragmatic, data-oriented, line of business applications. While the move to .NET brought the power of a unified framework and a managed platform to the application developer, the next release of Visual Basic includes a set of features that result in a profound effect on a developer s productivity when building data-oriented applications. These language extensions introduce general-purpose query facilities that apply to all sources of data, be it relational, hierarchical object graphs, or XML documents.

 

This article takes a look at these additions to Visual Basic.

 

So, What s New?

In this section we ll take a look at some of the most important features that have been added to Visual Basic. Here s a list of the additions to Visual Basic:

  • Support for LINQ
  • Lamda Expressions
  • Nullable Types
  • Partial Methods
  • Extension Methods
  • Object Initializers

 

The new version of Visual Basic supports LINQ, a new addition to Microsoft .NET Framework 3.5. Here s a code snippet that illustrates how you can query data using LINQ and VB.

 

Dim Employees = {New Employee With { .Code = 1, .Name = "Joydip"}, _

New Employee With {.Code = 2, .Name = "David"}}

 

And, now, you can query as shown in this code snippet:

 

Dim query = From Employee In Employees Select Employee

For Each Employee In query

 Console.WriteLine(Employee.Name)

Next

 

You can use Lambda expressions to define a nameless function, then use it as shown in the code snippet below:

 

Dim result = Function(myNumber) Math.Pow(myNumber, 1 / 3)

 MsgBox(result(8))

 

Nullable types allow you to assign null values to value types. You can find more about Nullable types in my article at: http://www.devx.com/dotnet/Article/35621.

 

You can define a Nullable type in Visual Basic in one of the following three ways:

 

Dim flag? As Boolean

Dim flag As Boolean?

Dim flag As Nullable(Of Boolean)

 

The Boolean variable flag can accept one of these values: True, False, or Nothing. You can then use the type in the same way you use other types. Here s an example:

 

If flag Then

   MsgBox("True")

       ElseIf Not married Then

   MsgBox("False")

       Else

   MsgBox("Un-defined")

End If

 

Now, if the Boolean variable flag is set to a value of Nothing , the message Un-defined will be displayed.

 

And, here s another example:

 

Dim Employees = New Employee With {.Code = 1, .Name = "Joydip", .PF = Nothing }

 

Recall that you had Partial Classes in the earlier version of Visual Basic. Now we have Partial Methods, as well.

 

Also, there are now anonymous types to define your type without having to define your class. Awesome, isn t it? Here s how you can do it:

 

Dim objEmployee = New With { .ecode = 12, .ename = "Joydip"}

 

Object Initializers enable you to initialize an object at the time it is instantiated. Here s how you can use Visual Basic to initialize an object using its properties at the time you instantiate:

 

Dim myObject = new MyClass with {.a = 100, .b = 200, .c = 300}

 

Conclusion

This article has had a look at the some of the most important features in the new version of Visual Basic that have been introduced as part of Visual Studio 2008. It is just the beginning; let s hope more will come and help Visual Basic regain its popularity and gain community respect. Please send me your comments. Happy reading!

 

Joydip Kanjilal is a Microsoft MVP in ASP.NET. He is the author of ASP.NET Data Presentation Controls Essentials (Packt Publishing; http://www.packtpub.com/asp-net-data-presentation-controls/book). He has more than 12 years of industry experience in IT with more than six years in Microsoft .NET and its related technologies. He has authored articles for some of the most reputable sites, like http://www.asptoday.com, http://www.devx.com, http://www.aspalliance.com, http://www.aspnetpro.com, http://www.sql-server-performance.com, http://www.sswug.com, etc. Many of these articles have been selected at http://www.asp.net (Microsoft s Official Site on ASP.NET). Joydip also was a community credit winner at http://www.community-credit.com a number of times. He is currently working as a Senior Consultant in a reputable company in Hyderabad, India. He has years of experience in designing and architecting solutions for various domains. His technical strengths include C, C++, VC++, Java, C#, Microsoft .NET, AJAX, Design Patterns, SQL Server, Operating Systems, and Computer Architecture. Joydip blogs at http://aspadvice.com/blogs/joydip and spends most of his time reading books, blogging, and writing books and articles. His hobbies include watching cricket and soccer, and playing chess. Contact Joydip via e-mail at mailto:[email protected] and view his MVP profile at https://mvp.support.microsoft.com/default.aspx/profile/joydip.

 

 

 

 

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