Lesson 2: Working With Controls
Controls in VB2008 are useful tools that
can be placed in the form to perform various tasks. They are used to create many
kinds of Windows applications. The diagram on the right is the Toolbox that contains the
controls of VB2008. They are categorized into Common Controls, Containers, Menus, Toolbars, Data, Components, Printings and Dialogs. At the moment, we will
focus on the common controls. Some of the most used common controls are Button, Label, ComboBox,
ListBox, PictureBox, TextBox etc. To insert a control into your form, you just
need to drag the control and drop it into the form. You can reposition and
resize it as you like. Let's examine a few programs that made use of Button,
Label, TextBox , ListBox and PictureBox . You don't have to worry so much about
the code because we will explain the program syntax as you progress to later
2.1 Using Text Box-A multiplication program
In this program, you insert two textboxes , three labels and one button. The two textboxes are for the users to enter two numbers, one label is to display the multiplication operator and the other label is to display the equal sign. The last label is to display the answer.
2.2 Using the ListBox-A program to add items to a list box
This program will add one item at a time as the user enter an item into the TextBox and click the Add button.
'To add items to a listbox
2.3 Using the PictureBox
In this program, we insert a PictureBox and a Button into the form. Make sure to set the SizeMode property of the PictureBox to StretchImage so that the whole picture can be viewed in the picture box. Key in the code as shown below and you can load an image from a certain image file into the PictureBox.