Getting Started with Visual Basic - .Getting Started with Visual Basic .NET Launch your Visual Basic
Embed Size (px)
Transcript of Getting Started with Visual Basic - .Getting Started with Visual Basic .NET Launch your Visual Basic
Getting Started with Visual Basic .NET Launch your Visual Basic .NET or Visual Studio software. When the software first loads, you'll see a screen something like this one:
There's a lot happening on the start page. But basically, this is where you can start a new project, or open an existing one. The first Tab, Projects, is selected. At the moment, the area labelled "Open an Existing Project" is blank. This is what you'll see when you run the software for the first time (because you haven't created a project yet). When you create a project, the Name you gave it will be displayed on this page, as a hyperlink. Clicking the link will open the project.
At the bottom of the screen, there are two buttons: "New Project" and "Open Project". To get started, click the "New Project" button. When you do, you'll see this dialogue box appear:
As a beginner, you'll normally want the option selected: "Windows Application", in the "Visual Basic Projects" folder. This means that you're going to be designing a
programme to run on a computer running the Microsoft Windows operating system.
If you look in the Name textbox at the bottom, you'll see it says "WindowsApplication1". This is the default name for your projects. It's not a good idea to keep this name. After all, you don't want all of your projects to be called "WindowsApplication1", "WindowsApplication2", etc. So click inside this textbox and change this Name to the following:
My First Project
Keep the Location the same as the default. This is a folder inside of your "My Documents" folder called "Visual Studio Projects". A new folder will then be created for you, and its name will be the one you typed in the "Name" textbox. All of your files for your first project are then saved in this folder.
Click the OK button, and the Visual Basic NET design time environment will open. It will look like the following (the 2008 edition is just the same):
That's a very daunting piece of software, hey? Well, don't worry. We'll break it down bit by bit in the next few sections, and pretty soon you'll be zipping your way around it like a pro!
Visual Basic .NET Forms
In the Visual Basic NET design time environment, the first thing to concentrate on is that strange, big square in the top left. That's called a form. It's actually the pretty bit of your programme, the part that others will see when they launch your masterpiece. Granted, it doesn't look too attractive at the moment, but you'll soon discover ways to lick it into shape.
To run the form, try this:
From the menu bar, click Debug From the drop down menu, click Start Alternatively, press the F5 key on your keyboard Your programme is launched
Congratulations! You have now created your very first programme. It should look like this:
Click the Red X on the form to stop it from running. You will then be returned to the software environment.
If you compare the first form with the one above, you'll see that they look very similar. But the one above is actually a real programme, something you could package and sell to unsuspecting village idiots
So what's going on? Why the two different views? Well, Visual Basic has two distinct environments, a Design environment and a Debug environment. Design Time is where you get to play about with the form, spruce it up, add textboxes, and buttons, and labels (and code, of course ); Debug is where you can test your programme and see how well it performs. Or doesn't perform, as is usually the case.
But don't worry about the terminology, for the time being. Just be aware that there's a two step process to VB programming: designing and debugging.
So, let's get on and do some designing! Before we can start designing a form, though, we need some tools. And where are tools kept? In a toolbox!
Click below for the next lesson (unless you fancy buying my VB .NET book!).
Adding Controls Using the Toolbox
Things like buttons, textboxes, and labels are all things that you can add to your Forms. They are know as Controls, and are kept in the Toolbox for ease of use.
The Toolbox can be found on the left of the screen. In the picture below, you can see the toolbox icon next to Form1:
To display all the tools, move your mouse over the toolbox icon. You'll see the following automatically appear:
There are seven categories of tools available. The toolbox you'll be working with first is the Common Controls toolbox. To see the tools, click on the plus symbol next to Common Controls. You'll see a long list of tools:
As you can see, there are an awful lot of tools to choose from! For this first section, we'll only be using the Button, the TextBox and the Label.
If you want to keep the toolbox displayed, click the Pin icon next to the X. To close the toolbox, simply move your mouse away.
In the next part, we'll see how to add a textbox to the form.
Adding a Tool (Control) to your Form
Let's start by adding a textbox to our form. With the tools displayed, do the following:
Locate the TextBox tool Double click the icon A textbox is added to your form
The textbox gets added to the top left position of your form. To move it down, hold your mouse over the textbox and drag to a new position:
Notice the small squares around the textbox. These are sizing handles. Move your mouse over one of them. The mouse pointer turns into an extended line with arrowheads. Hold your left mouse button down and drag outwards. The textbox is resized. Play around with the sizing handles until you're happy with the size of your textbox.
One thing you will notice is that you can't make the size any higher, but you can make it wider. The reason why you can't make it any higher is because the default action of a textbox is to have it contain only a single line of text. If it's only going to contain one line of text, Microsoft reasoned, there's no reason why you should be able to change its height. A textbox can only be made higher if it's set to contain multiple lines of text. You'll see how to do this soon.
Create two more textboxes by double clicking on the textbox icon in the toolbar (Or Right-click on the selected textbox and choose Copy. Then Right-click on the Form and choose Paste.)
Resize them to the same size as your first one Line them up one below the other with space in between Try to create something that looks like the one below
Adding a Label to your Form
Let's add some labels near the textboxes so that your users will know what they are for.
Locate the label control in the toolbox Double click the label icon A new label is added to your form It should look like the one below
Click on the label to select it. Now hold your left mouse button down on the label. Keep it held down and drag it to the left of the textbox.
Create two more labels, and position them to the left of the textboxes. You should now have a form like this one:
To see what your Form looks like as a programme, click Debug > Start from the menu bar. Or press F5 on your keyboard:
To stop the programme from running, you can do one of the following:
1. Click the Red X at the top right of your Form 2. Click Debug > Stop Debugging from the menu bar 3. Press Shift + F5 on your keyboard
You can also click the Stop button on the VB toolbars at the top, as in the image below:
All right, we're getting somewhere. We now have a form with textboxes and labels, something that looks like a form people can fill in. But those labels are not exactly descriptive, and our textboxes have the default text in them. So how can we enter our own text for the labels, and get rid of that default text for the textboxes?
To do those things, we need to discuss something called a Property.
You've probably noticed the area to the right of the design environment, the area with all the textboxes in a grid, the one that has those daunting names like "AccessibleDescription", "AccessibleName", "AccessibleRole". That's the Properties box.
Click anywhere on the form that is not a label or a textbox, somewhere on the form's grey areas. The form should have the little sizing handles now, indicating that the form is selected.
On the right of the design environment there should be the following Properties box:
If your Properties box says "Textbox1 Textbox" or "Label1 Label" then you haven't yet selected the Form. Click away from the textbox or label until the Properties box reads "Form1 Form"
What you are looking at is a list of the properties that a form has: Name , BackColor, Font, Image, Text, etc. Just to the right of these properties are the values for them. These values are the default values, and can be changed. We're going to change the value of the Text property.
First, you might want to display the list of Properties in a more accessible form. You can display the list properties alphabetically. To do that, click the Alphabetic icon at the top of the Properties box, as in the image below:
This will make the properties easier to find.
Before we change any in the Properties box, let's clear up what we mean by "Property".
What is a Property?
Those controls you added to the form (textboxes and labels), and the form itself, are called control objects. You can think of controls as things, something solid that you can pick up and move about. Controls (things) have properties. If your television were a control, it too would have properties: an On/Off button property, a colour property, a volume property, and a ... well, what other properties would your television have?