Visual Basic

Visual Basic

1. What is it

   • Visual Basic is one of the many programming languages ​​that we can find today. This language is born from the BASIC (Beginner's All-purpose Symbolic Instruction Code) that was created in its original version at Dartmouth College, with the purpose of serving those people who were interested in getting started in a programming language.

2. forms and their most common properties

   • The form is the first object or control that is displayed in Visual Basic and constitutes the screen or window over which other objects or controls are placed such as labels, text controls, buttons, etc. and of course the necessary code of our programs, therefore will constitute the user interface.
   • Forecolor
   • Backcolor
   • Name
   • Caption

3. Tool box

   • Shows the components that you can add to Visual Basic designers

4. Controls

   • Intrinsic controls
     • These controls are located within the Visual Basic executable file. Intrinsic controls are always included in the toolbox, not like Activex controls, which can be removed or added to the toolbox. Below is a list of intrinsic controls.
   • ActiveX controls
     • Are those controls that exist as independent files with extension file name .ocx. These include the controls available in all editions of Visual Basic (grid controls, combo box and list linked to data and several others) and those that are only available in the Professional Edition and Enterprise Edition (such as Listview, Toolbar, Animation and Tabbed Dialog). To these are also added ActiveX controls from other manufacturers.

5. properties of objects

   • An important goal of many of the object-oriented programming languages ​​is to allow you to encapsulate internal details in a class. Visual Basic .NET or Visual Basic 2005 allows you to define properties to provide controlled access to internal details in a class.

6. control structures

   • allow you to take decisions and perform a process repeatedly. These are the so-called bifurcations and Loops This type of structures are common in terms of concept in most of the programming languages, although their syntax may vary from a language of programming to another. These are very important structures because they are the responsible for controlling the flow of a program according to the requirements of it.
   • FOR EACH-WEND
     • This construction is similar to the For loop, with the difference that the variable that controls the repetition of the loop does not take values ​​between a minimum and a maximum, but from the elements of an array (or a collection of objects).
   • WHILE.WHEND
     • This sentence is another way to generate loops that are traversed while the initial condition
   • DO-LOOP
     • Repeats the execution of a set of statements while a condition given true, or until a given condition is true. The condition can be verified before or after the execution of the sentence set.
   • IN-THESE-ELSE
     • This structure allows one or more sentences to be executed conditionally
   • FOR-NEXT
     • The For statement gives rise to a loop or loop, and allows executing a set of sentences a certain number of times
   • SELECT CASE
     • This sentence allows executing one of several actions depending on the value of a expression.

7. type of data

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