Best Visual Basic Programming in 2022


Learn the Basics of Programming in Visual Basic

If you're interested in learning to program in Visual Basic, you've come to the right place. This comprehensive guide will help you learn the basics of programming in Visual Basic. Topics covered include control structures, loops, using a large function library, and writing your own functions. You'll also learn how to use Windows controls, access files, handle errors, and more. And because the basics of programming are always applicable to any situation, you'll learn how to use event-driven and object-oriented approaches.

Object-oriented programming

Object-oriented programming in Visual Basic is a type of program design where code is organized around objects. An object is an abstract data type, and its procedures are called "methods" and "properties." A class can inherit from other classes. A class can be derived from a parent class, or from a superclass. Classes can also have multiple children and sub-children. This separation of concerns is a valuable benefit for object-oriented programs.

An object created according to a class is called an instance. The instance has the same interface and data structure as the class, but differs in the internal data. For example, the Human class contains an attribute named name and an attribute called age. A method called greet() is also available. An instance of the Human class will have these same methods, but the value of these attributes will be different. This makes object-oriented programming in Visual Basic an excellent choice for many programs.

Unlike procedural or functional languages, object-oriented programming is easier to learn and implement in Visual Basic. It uses the principles of polymorphism, encapsulation, and inheritance. These concepts simplify complex reality, while abstraction helps you define the simplest components of your program. By using abstraction, you can create a simpler and more maintainable application. You can also use inheritance to create new classes, and polymorphism allows different classes to implement the same properties.

Object-oriented programming in Visual Basic is a type of program design where objects are categorized according to their properties. The class that defines a particular object is known as a class, while the object is a usable instance. The latter is referred to as an instance. Creating an object in this way enables you to assign values to instance properties and invoke class methods. The shared members of a class are also shared among all instances of the class. Object-oriented programming in Visual Basic also provides a light version of a class, referred to as a structure. These classes are a great option for storing large object arrays without consuming too much memory. An object can have various properties and methods that are specified in the declaration.

Drag-and-drop techniques

You can use drag-and-drop techniques in Visual Basic Programmation to move objects from one place to another. The drag-and-drop technique works by using two properties: the target and the source. The target is the object that the user wants to move, while the source is a control on the same form. The source is the control from which the user wants to move the object. The state of the target is indicated by the allowDrop property.

You can define the drag-and-drop action by modifying the KeyState property of the control. You can use a single-item drag, or multiple-item drag. In both cases, you must create an event to control the drag operation. This event must occur after the drag operation. To prevent the drag event from being triggered prematurely, use the NumCorrect% property.

Drag-and-drop events are dispatched to listeners on View objects. The listeners should respond by calling DragEvent#getAction(). This callback method returns a String indicating if the drag operation is successful or unsuccessful. If it is successful, the drag event listener should return true. If the drag event is unsuccessful, however, it should return false. It is important to note that the drag event listener cannot be called during the start of the drag operation.

Drag-and-drop techniques in Visual Basic programming have become increasingly common in Windows applications. It is not difficult to implement but it is largely unknown. The techniques described in this article will help you add drag-and-drop functionality to your Visual Basic program. These techniques are based on the DragMode property of controls. The drag operation begins when the mouse button is pressed over the target object.

Functions

A Visual Basic Programming function is a group of statements enclosed in a procedure. A procedure runs a series of commands, a series of statements that perform a specific task, and then returns a value to the calling code. A function is defined in a module, class, or a method and is public by default. Any application with access to the module or method can call it. A function is a powerful tool to perform complex calculations, and they can also be called by other applications to carry out a specific task.

The name of a Visual Basic function is up to you, but keep it simple and clear so that it's easier to remember and debug your code. The function name must start with the word "function", followed by the function name. The first character in the function name must be a character, with special characters excluded. Moreover, function names must be less than 255 characters, including spaces and the first character. Additionally, Visual Basic function names are case-sensitive, so be careful when creating one.

Subroutines are similar to functions, but they don't return a value when finished. A function, on the other hand, returns a value. In contrast, a subroutine does not return a value and uses the "End Sub" statement in the last part of the procedure. A Visual Basic function must return a value. There are two ways to do this. The first way is to call a function "sub", which is similar to calling a sub-routine by the same name.

A Visual Basic program requires carefully structured code. The code is typically stored in one project. Sub-routines are further separated into self-contained and re-usable procedures. In Visual Basic Programming, this is a way to divide the program into logical functionalities. If you don't know much about Visual Basic, you can learn about the language by taking online training courses. The O'Reilly learning platform is also a great resource for learning the language.

Sub procedures

Visual Basic Programming sub procedures perform tasks and take arguments. They can be accessed from outside the defining module. A Sub procedure can calculate the product of two numbers, such as the area of a rectangle or square. A Sub procedure also has a scope, so it is possible to use the name of a variable to make it public. It is also possible to use parameters and overloading. The following example shows the usage of Sub procedures.

A Sub procedure is a block of code enclosed by the End Sub and the first Sub statements. Each sub procedure performs a specific task. When a procedure is called, it returns control to the calling code, not a value. The statements within a Sub procedure are executed each time a procedure is called. A Sub procedure begins with an Executable statement after the first Sub statement and ends with an Exit Sub statement.

A Sub procedure uses intrinsic VBScript functions to prompt a user for information. Depending on the information entered by the user, it then calculates and displays the results of a function. This function is called in another VBScript procedure. A sub procedure uses intrinsic VBScript functions to access data and control whether it changes. It also supports passing data by reference and by value. It is common practice to create several small procedures and call them from a main procedure.

You can save the most commonly used VBA Sub procedures in a module. The module will automatically create a VBA project that contains the named procedure. Select the module in which you want to use the VBA Sub procedure. Then, go to Module 1 and double-click on Sub Procedure. You will see the Sub Procedure on the right-hand side. When naming a Sub Procedure, the first letter must be an alphabet, but it can contain both letters and numbers. The maximum name limit is 64 characters. There are also Property Procedures. These procedures are used in Class modules. They can be used to set properties of ActiveX controls.

Databases

Databases are used by business applications for storing large volumes of data. The term database management system (DBMS) refers to a type of software that manages the storage of data in databases. Microsoft Visual Basic provides tools for creating an RDBMS that stores information according to defined relationships. Tables within an RDBMS store data in the form of data values. There are two main types of databases: relational and non-relational.

When you're developing a program, you'll need to work with a database. Visual Basic Classic allows you to use ActiveX Data Objects (ADO), which can allow you to administrate your database through programmatic means. The ADO connection string specifies a locale identifier, which can be helpful for non-US formatted dates. The example below shows how to create a table in an RDBMS database.

Using a database to store information is important if you want your application to be accessible to users outside of the corporate environment. For example, if your database contains data from an unemployment office, it would be extremely difficult to retrieve it again in the event that some information gets lost or is incorrect. In such a situation, you'll need to document every aspect of your database, including its data structure and features. In Visual Basic, the code for the database application is located in a file named ORACLE_BASEORACLE_HOMEOO4OVBSAMPLESQT.

Another common example of a database is a table with customer names. The table contains a general description and table columns. Then, you add additional fields to the table such as the customer's name, company, and postcode. These fields will be displayed in your database browser. Once you're done, click the OK button to run your program. The name of Chris Wells should be displayed on the screen.


Lisa Brooke-Taylor

I am passionate about 2 things, our customers success and helping public sector organisations better serve and protect citizens. Building relationships to understand their critical business issues, working with them to identify innovative and cost effective solutions to transform their organisations and maximise their investment. Many public sector organisations are already familiar with some Microsoft technologies, with our Mobile first, Cloud first vision, we can help deliver a truly flexible, mobile and productive platform for their workforce, enabling them to improve services to their customers.

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