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Basic Form construction

VB.NET coupled with the Visual Studio IDE makes it easy to build graphical user interfaces (GUIs) with a simple drag and drop system. This was mentioned earlier in the tutorial in a bit of detail, covering a few of the controls that are available in the Toolbox of Visual Studio. This article of the tutorial will cover the very basics of building a GUI using the Visual Studio IDE.

Introduction

A window is almost exactly the same as a Form in VB.NET. As a matter of fact, WindowsForms is an API (application programming interface) that does the work of creating windows and is so called because it interfaces with the Windows operating system underneath. The term Form is used to describe the style that WindowsForm, i.e. the .NET window builder, uses to build these windows.

A Form is derived from Control which in turn is derived from Object, the base class of all .NET Framework classes.

The following steps show how to create a GUI in VB.NET.

Creating a WindowsForms user interface without the GUI builder

The moderately old fashioned way of building a user interface that the end user can interact with is by using code. The majority of .NET languages in Visual Studio will create the interface code behind the scenes automatically when a control is placed or whatever, but it is also important to know how to do this without the GUI editor because occasionally manual editing is needed, for instance to clear up unnessary code or to fix a problem in the code.

This article will cover this in much more detail as it will show how to interact with the GUI from code as it progresses.

Creating a WindowsForms user interface with the GUI builder

WindowsForms GUI creator

Create a Windows Forms Application

Once this has been selected the WindowsForms Designer will look like the next image.

The GUI builder

The GUI builder in Visual Studio

As mentioned earlier in the tutorial, Visual Studio makes building an graphical user interface much easier. It provides a collection of tools for this including a toolbox full of controls.

It also implements a drag and drop system for creating the interface. This part of the tutorial will explain layout, controls and visual design.

Designing the Form

A Form is given Controls which include buttons, picture boxes, labels, list boxes and more. They are used to provide a program with a user interface that allows a much easier interaction than just providing command lines. This article covers the very basics of Button, ListBox, PictureBox, Label and LinkLabel controls.

Button

The Button is the most simple form of user interaction with the program. It is often used for debugging parts of programs during development because of the easy setup but it's purpose within final programs is also very important.

Buttons are generally used to perform an action.

Default Action

The default action for a Button is of course Click . The signature for this is shown below:

VB.NET
Private Sub Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button.Click
		
Button

A Button control

ListBox

The ListBox control is used to provide a list (or an array) of information in a user friendly manner. It's uses are however slightly limited in user interfaces because custom controls can offer much more than the ListBox can.

Default Action

The default action for the ListBox control occurs when the item in the list box that is selected changes.

VB.NET
Private Sub ListBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox.SelectedIndexChanged
		
Listbox

A ListBox control

PictureBox

The PictureBox control is used to display an image without any extra requirements (such as painting it on the form) other than just setting the property.

Default action

PictureBox controls also use the Click event as their default action.

VB.NET
Private Sub PictureBox_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox.Click
		
PictureBox

A PictureBox control

Label

The Label control works similarly to the PictureBox control in that it is used to represent information, in this case it represents textual information.

Default action

Like the PictureBox the default action for a Label control is the Click event.

VB.NET
Private Sub Label_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label.Click
		
Label control

A Label control

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