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Writing a VB program

From: Visual Studio 2010 Essential Training

Video: Writing a VB program

Visual Basic is the other leading language for programming .NET. You may know it by its VB acronym or as Visual Basic .NET, but it's officially known within Microsoft as Visual Basic. C# and VB share a lot of features and are more similar than different in .NET 4.0. According to my sources at Microsoft, these two languages are tremendously popular and account for the highest percentage of .NET programmers. In this movie, I want to show you some basics of the VB language and its editor.

Writing a VB program

Visual Basic is the other leading language for programming .NET. You may know it by its VB acronym or as Visual Basic .NET, but it's officially known within Microsoft as Visual Basic. C# and VB share a lot of features and are more similar than different in .NET 4.0. According to my sources at Microsoft, these two languages are tremendously popular and account for the highest percentage of .NET programmers. In this movie, I want to show you some basics of the VB language and its editor.

I'm inside Visual Studio, and I have open up this project called VBEditor. I have one code file here called module1.vb. The vb extension signifies that this code file contains Visual Basic code. I'll double-click on Module1.vb and load it in the editor. In Visual Basic when you're working in a console application, you have to specify a Sub Main, a main entry point for the application. So you call it Sub Main, and you put it inside a Module. I'm going to write some code to read and write information out to this console window.

I'll start by writing a piece of information to the console. To do that, I use the Console Class. Notice that dropdown IntelliSense I have get here inside Visual Studio is showing me the available types I can work with. At this point, I've typed enough for Visual Studio to recognize the word "console", and I can just press Tab to finish typing. Then I'll type in period and then Wri, there I find a recognition for Write and WriteLine. I am pressing the up and down arrows on my keyboard right now to get this.

Now I am going to press the enter key while WriteLine is selected. Visual Basic knows that this is a method call, so it puts the open and close parentheses automatically on that line. This is something that VB does that the C# editor does not do. This would write a blank line. I'd rather write something out of the console so I am going to come up to this line and type something in the parentheses. I am going to type in, "Hello. What is your name?" To end a line of code in VB, you just hit the Enter key. Nothing special is required, like the semicolon in C#.

So I am going to move down to the next line, and I am going to show you what happens when I run the application at this point. If I'm inside Visual Studio and I go up to Debug > Start Debugging, the application is going to run, my code will run, and then immediately terminate, so don't blink while you watch this. Did you see that window pop up? I don't want that to happen. I'd rather wait and see what the results are, so there's a mechanism inside Visual Studio to make that happen.

It's up here in the Debug > Start Without Debugging. Let's run the application again using this menu item. You see the difference? This time the application runs, asks me what my name is. My application is now terminated, but Visual Studio keeps the Console window open so it can read the results. Then I press any key on my keyboard to close this window. I'm going to press the Spacebar. I would rather have my own code listening to the keystrokes, so I am going to come down to line 9 on my computer and type in "Console.ReadLine".

That reads whatever the user types on the console and puts it in a variable. Well, I don't have a variable yet so let's make one. In Visual Basic, you use the Dim keyword to declare a variable like this, "Dim name As string". Enter. I am going to copy this Console. ReadLine, paste it down here, Ctrl+V, and then I am going to say on line 12, on my computer "name =".

So let's review what's happening. I'm writing this string to the console and declaring a variable, I am asking the user for their name, and I am storing it in this variable. Then I'm going to write again to the console. Choose copy. I'll come down here under line 13. I am going to paste it in, Ctrl+V, and then I am going to concatenate this variable on the end.

Concatenation just means taking two strings and putting the second string on the end of the first string. So I am going to say Hello and then ampersand, which is the concatenation operator in Visual Basic, name, and then I'll wait for the user to close the application. Let's try this one. Debug > Start Debugging. I type in my name, "Walt Ritscher", hit the enter key. It mirrors that back to me Hello Walt Ritscher, and then it waits for me to press the Enter key to terminate the application.

Next, I am going to show you how to declare a different type of variable. I am going to say Dim fs As New System.IO.FileStream. I am going to press the down arrow to move to FileStream and then press the Enter key. What this is saying is, "Declare a variable and instantiate an instance of this class, the FileStream class and store the instance in this variable." Now to simplify my life, I can eliminate typing in System.IO, so I'm going to delete this.

Notice I get a blue squiggle at this moment because it doesn't recognize the class name. I will then scroll up to the top of my Code module and type in an import statement up here, "Imports System.IO". Make sure you spell it correctly. Now look at line 18 in my code. That blue squiggle that was under FileStream has disappeared. That signifies that it recognized that as a valid class. Putting this Import at the top of my code simplifies the body of my code document.

So what I have showed you so far today is how to read and write from a console in Visual Basic. Obviously, teaching VB would take a course of its own. You will see more examples of it later in this course.

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This video is part of

Image for Visual Studio 2010 Essential Training
Visual Studio 2010 Essential Training

86 video lessons · 30152 viewers

Walt Ritscher
Author

 
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  1. 2m 3s
    1. Welcome
      1m 2s
    2. Using the exercise files
      1m 1s
  2. 7m 19s
    1. Understanding the Visual Studio versions
      3m 51s
    2. Setting up your developer computer
      3m 28s
  3. 58m 2s
    1. Creating a Visual Studio project
      4m 58s
    2. Working with Solution Explorer
      6m 32s
    3. Working with big projects
      3m 53s
    4. Taking a tour of the Integrated Developer Environment (IDE)
      8m 36s
    5. Introducing drag-and-drop UI design
      7m 38s
    6. Working with the Properties window
      6m 44s
    7. Looking at Server Explorer
      7m 4s
    8. Exploring the new Help engine
      6m 41s
    9. Setting options for the IDE
      5m 56s
  4. 39m 25s
    1. Creating a simple WPF application
      1m 32s
    2. Building the UI with the editors
      9m 14s
    3. Working with the application code
      3m 37s
    4. Communicating with the web site
      7m 15s
    5. Connecting your data
      8m 4s
    6. Binding to an RSS feed
      5m 4s
    7. Packaging and deploying the application
      4m 39s
  5. 39m 46s
    1. What languages are supported in Visual Studio 2010?
      1m 17s
    2. Exploring basic settings for the Code Editor
      5m 35s
    3. Writing a C# program
      6m 48s
    4. Writing a VB program
      6m 29s
    5. Working with C++
      6m 38s
    6. Working with F Sharp
      6m 9s
    7. Font and color options
      6m 50s
  6. 1h 5m
    1. Formatting your code
      6m 43s
    2. Navigating your code
      7m 44s
    3. Using the Task List
      2m 26s
    4. Commenting your code
      2m 45s
    5. Documenting your code
      8m 26s
    6. Using IntelliSense effectively
      7m 0s
    7. Working with code snippets
      6m 25s
    8. Refactoring your code
      5m 15s
    9. Understanding code generation
      2m 10s
    10. Generating code with T4
      6m 29s
    11. Using the Class View, Class Designer, and Class Diagram tools
      5m 51s
    12. Refactoring VB with CodeRush Xpress
      4m 33s
  7. 1h 11m
    1. Working with project and item templates
      8m 38s
    2. Creating a console application
      7m 5s
    3. Creating a class library
      6m 26s
    4. Creating a web site with ASP.NET
      7m 37s
    5. Creating a rich internet application with Silverlight
      6m 57s
    6. Creating a classic Windows application with Windows Forms
      10m 31s
    7. Creating a dramatic Windows application with Windows Presentation Foundation (WPF)
      4m 41s
    8. Creating a WCF service
      9m 1s
    9. Using an existing WCF service
      6m 38s
    10. Navigation UI designs with the Document Outline view
      3m 41s
  8. 33m 18s
    1. Creating a data project with SQL Project
      6m 24s
    2. Clarifying the confusion on .NET Data
      3m 31s
    3. Using ADO.NET in your application
      6m 50s
    4. Creating typed datasets
      7m 55s
    5. Using the data binding tools
      8m 38s
  9. 30m 13s
    1. Debugging code
      9m 32s
    2. Working with the Watch and other debug windows
      7m 46s
    3. Other debugging techniques
      6m 50s
    4. IntelliTrace historical debugging in Visual Studio Ultimate
      6m 5s
  10. 17m 56s
    1. Understanding Visual Studio editions and test tools
      2m 22s
    2. Verifying your code with unit tests
      8m 58s
    3. Running performance and load tests
      6m 36s
  11. 34m 5s
    1. Building your application
      4m 19s
    2. Customizing the build process with MSBuild
      6m 36s
    3. Setting assembly information
      2m 12s
    4. Deploying a basic Windows application
      2m 19s
    5. Creating an installer with Visual Studio
      7m 39s
    6. Creating a ClickOnce application
      5m 13s
    7. Setting up IIS for deploy
      2m 9s
    8. Deploying a Silverlight or ASP.NET application
      3m 38s
  12. 14m 0s
    1. Understanding source control
      2m 9s
    2. Setting up Team Foundation Server source control
      3m 5s
    3. Using Team Foundation Server source control
      8m 46s
  13. 17m 31s
    1. Understanding the .NET Office integration
      4m 16s
    2. Making a Word 2010 application
      7m 54s
    3. Making an Excel 2010 add-in
      5m 21s
  14. 31m 34s
    1. Understanding the extensibility model in Visual Studio
      2m 17s
    2. Adding external tools to the Tools menu
      4m 42s
    3. Creating macros
      7m 16s
    4. Using the Extension Manager
      5m 1s
    5. Creating an MEF add-in
      7m 9s
    6. Deploying and installing an add-in with VSIX
      5m 9s
  15. 25m 34s
    1. Working with configuration files
      5m 37s
    2. Using the Settings Editor
      7m 30s
    3. Using the Resources Editor
      6m 59s
    4. Localizing your resources
      5m 28s
  16. 1m 17s
    1. Goodbye
      1m 17s

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