Visual Basic provides a convenient method for building user interfaces. ☆ Visual Basic can interface with code written in C, for efficiency. A Simple Program. Visual Basic Tutorial at caite.info, which has attracted millions of visitors The Visual Studio Integrated Development Environment. Visual Basic was initially introduced in as the first programming Thus, learning to create Visual Basic applications requires being very familiar with.
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VISUAL BASIC is a VISUAL and events driven Programming caite.info are the main divergence from the old BASIC. In BASIC, programming is done in a . Learn Visual Basic Notice. These notes were developed for the course, “ Learn. Visual Basic ” They are not intended to be a complete reference to Visual. Here you will get the material for computer IT and Visual Basic language (VB) related courses and tutorials. The materials for which you will get the PDF, DOC, .
Download free Learning to Program with Visual Basic and. Computer-based Database management systems can handle data much faster and more efficient than human beings do. You can write a program code as shown below: Polymorphism Object-oriented programming allows procedures about objects to be created whose exact type is not known until runtime. EventArgs Handles CheckBox3. The event procedure is as follows: Height Where X..
First of all.. For example. In order to qualify as a fully object oriented programming language. The data components of a class are called instance variables and one instance of a class is an object.
Polymorphism Object-oriented programming allows procedures about objects to be created whose exact type is not known until runtime. Pascal and Fortran. Previous versions of VB are known as procedural or functional programming language. A class consists of data members as well as methods. Some other procedural programming languages are C. In VB Another example is student class is a subclass of the human class while your son John is an instance of the student class.
Everything else about that step is inherited. VB allows users to write programs that break down into modules.
An object can be created out of a class and it is known as an instance of the class.. It is different from the earlier versions of VB because it focuses more on the data itself while the previous versions focus more on the actions. That means less programming is required when adding functions to complex systems.
It also allows new shapes to be easily integrated.
A class can also comprise subclass. VB6 is not a full OOP in the sense that it does not have inheritance capabilities although it can make use of some benefits of inheritance. The ability to reuse existing objects is considered a major advantage of object technology. If a step is added at the bottom of a hierarchy.
These modules will represent the real-world objects and are knows as classes or types. Show Birthdate MessageBox. Show Gender MessageBox. To create class.. Show Name MessageBox. Show MyObject. In order to use the BMI class.
Rename the class as MyClass. Rename the form as MyFirstClass. BMI h.
Thank you sir. May 1. Why it loads the previous form not the new one? Pls reply thank you Reply Abdullahi Tijjani R. Thanks a lot. In your first lesson.. Reply Vinod Trivedi says: In this lesson. A class has events as it creates instant of a class or an object. When we start a windows application in Visual Basic in previous chapters. I will keep the theories short so that it would not be too difficult for beginners. You have understood the meanings of class. An event is related to an object.
Event driven means the user will decide what to do with the program. You have also learned to write some simple programs without much understanding some underlying foundations and theories. Enter as so on. The is the structure of an event procedure. It does nothing other than loading an empty form. This procedure includes the Form1 class and the event Load.
In this case. The code must be entered between Private Sub……. End Sub. Object, ByVal e As System. ForestGreen Me. Cyan End Sub End Classs The first line of the code will change the title of the form to My First Visual Basic Program, the second line will change the foreground object to Forest Green in this case, it is a label that you insert into the form and change its name to Foreground and the last line changes the background to Cyan color.
Me is the name given to the Form1 class. We can also call those lines as Statements. So, the actions of the program will depend on the statements entered by the programmer. The output is shown in the windows below:. The keyword Dim is to declare variables name1, name2 and name3 as string, which means they can only handle. The output is shown below:.
May 25, at 5: I have benefited alot from this work.. April 3. For currency calculation. VB divides data into different types so that it is easier to manage when we need to write the code involving those data. Managing Data in Visual Basic Visua. Visual Basic Lesson In Visual Basic Similarly in Visual Basic Programs that require high precision calculation need to use Single and Double decision data types.
Examples of numeric data types are your examination marks. Object data type and Variant data type.
They are summarized in Table 6. In some cases.. Some of the suffixes are displayed in Table 6. Visual Basic Lesson 6. These data types summarized in Table 6. The non-numeric data comprises text or string data types. In term of VB The following are few examples: Like the mail boxes. Strings can contain any characters. The contents of the variables changes every now and then.
To name a variable in Visual Basic For the variable-length string. Dim password As String. If you fail to do so. The format is as follows: For string declaration. The expression could be a mathematical expression. The following are some examples: Mathematical Operations in Visual Basic. The list of Visual Basic arithmetic operators are shown in table 7. In order for Visual Basic to carry out arithmetic calculations.
The Visual Basic arithmetic operators are very similar to the normal arithmetic operators. In case you have forgotten the formula for the Pythagoras Theorem. Click the button and key in the code as shown below. Visual Basic Lesson 7. Note how the various arithmetic operators are being used.
When you run the program. If you only know your weight and height in lb and feet. You can refer to the following range of BMI values for your weight status. BMI Calculator A lot of people are obese now and it could affect their health seriously. EventArsgs Handles Button1.
If your BMI is more than Click Dim height. Obesity has proven by the medical experts to be a one of the main factors that brings many adverse medical problems.
The reading suggests that you are healthy. In this example. Here are more arithmetic projects you can try to programs: Reply poorani says: Mathematical Operations Aryiana petroni says: Reply slicer says: Visual Basic Lesson 8.
String Manipulation in visual basic V. Click Dim text1. ByVal e As System.. Dim text1. Example 8. String Manipulation in visual basic V..
Click Label1. The Output: Right text1. For example.. Text Label1. The format is Microsoft. April 1. This is in Visual Basic Visual Basic Lesson 9. These operators allow a VB programto compare data values and then decide what actions to take. In order to control the program flow and to make decisions. ElseVisual Basic Tutorial 1 of 7 http: Normally they are used to compare two values to see whether they are equal or one value is greater or less than the other value.
Using If. These operators are shown in Table 9. Using If…. They are also known as numerical comparison operators. Decision making process is an important part of programming because it can solve practical problems intelligently and provide useful output or feedback to the user. The comparison will return a true or false result.. Then… Else statement and If…. Then statement.
ElseVisual Basic Tutorial 2 of 7 http: There are basically three types of If control structures. In making strings comparison. These logical operators are shown in Table 9. Upper case letters are less than lowercase letters. In order to provide a choice. Then…Else Statement Using only If…. EventArgs Handles Button Using If ElseVisual Basic Tutorial 3 of 7 http: On the other hand. This control structure will ask the computer to perform a certain action specified by the Visual Basic expression if the condition is true.
Then statement is not very useful in programming and it does not provide choices for the users. And when the condition is false.. The general format for the if…then. Then…Else Statement. Click Dim myNumber. ElseVisual Basic Tutorial 4 of 7 http: On the other hand.. In order to provide more choices. In this example.. Then…ElseIf Statement. ElseVisual Basic Tutorial 5 of 7 http: Then…ElseIf Statement If there are more than two alternative choices.
Else statement will not be enough. This means that both the conditions must be fulfilled in order for the conditions to be true Using If.. ElseVisual Basic Tutorial 6 of 7 http: ElseVisual Basic Tutorial 7 of 7 http: Select Case is preferred when there exist multiple conditions because using If…Then.
ElseIf statements will become too messy. ElseIf statement may also compute entirely different dimensions.. ElseIf control structure.. The difference is that the Select Case control structure basically only make decision on one expression or dimension for example the examination grade while the If …ElseIf statement control structure may evaluate only one expression. Select Case control structure is slightly different from the If…. ByVal e As Label1. ByVal be computed as follow: Text Case 50 to 59 Select Case mark Label Text Button1.
The grades can sender As System. Looping is required when we need to process something repetitively until a certain condition is met. Next loop. Example For its application. Next Loop.. Next Loop The format is: This is generally called looping. End while loop Looping in Visual Basic Visual Basi.
Add sum Else Next ListBox1. End If Next The program will compute the subtraction as follow: The process will stop when n is ……….
Click Loop Dim sum. ByVal e TextBox The syntax to use is known as Exit Do. Lets examine the following examples Example The Title argument will display the title of the message board. Style Value. The Style Value will determine what type of command buttons appear on the message box. Title The first argument. Functions Part 1Visual Basic Tutorial 1 of 6 http: This syntax is as follows: There are two types of functions in Visual Basic The general syntax of a function is FunctionName arguments The arguments are values that are passed on to the function.
Visual Basic will automatically shows up a list of named constants where you can select one of them. Functions Part 1Visual Basic Tutorial 2 of 6 http: Table It has to be declared as Integer data type in the procedure or in the general declaration section. The values are determined by the type of buttons being clicked by the users. Functions Part 1Visual Basic Tutorial 3 of 6 http: There are four types of icons available in Visual Basic as shown in Table The arguments are explained as follows: Prompt — The message displayed normally as a question asked.
Title — The title of the Input Box. Functions Part 1Visual Basic Tutorial 4 of 6 http: Functions Part 1Visual Basic Tutorial 5 of 6 http: InputBox Prompt. Show userMsg Else MessageBox. Functions Part 1Visual Basic Tutorial 6 of 6 http: I have already shown you a few string manipulation functions in Lesson 8. The syntax of the Mid Function is Mid phrase. The diagrams are shown below: After a phrase is entered and the OK button is pressed. The following code extracts the left portion any phrase entered by the user.
The following code extracts the right portion any phrase entered by the user. The syntax is Microsoft. Right myword. For example: Left myword. For example Instr 1. The syntax is Instr n. You can write a program code as shown below: Some of the characters may not be displayed as they may represent some actions such as the pressing of a key or produce a beep sound. The syntax of the Chr function is Chr charcode and the syntax of the Asc function is Asc Character The following are some examples: LCase Phrase For example.
UCase Phrase Microsoft. There are numerous built-in mathematical functions in Visual Basic which we will introduce them one by one. Functions Part III. The syntax is Math. Fix 9. Exp num1 Label1. Log num1 Label1. The Rnd function returns a random value between 0 and 1. Random numbers in their original form are not very useful in programming until we convert them to integers. Int For example Int 2. Int 6. Round 7. Round num1. After adding 1. The Format is Round n. Functions Part IV.
Formatting Functions -. There are two types of Format functions in Visual Basic Fixed To display the Format Currency To display the Format Percent Converts the number Format 0. Standard To display the Format Examples of user-defined formatting style are listed in Table Format Now. The predefined formats of date and time are shown in Table Date and Time Formatting functionsVisu. The user can choose underline. EventArgs Handles BtnCalculate. Shopping Cart The program code for shopping cart: End If If CheckBox3.
If CheckBox3. The code is as follow: EventArgs Handles CheckBox1. CheckedChanged If CheckBox1. Checked Then TextBox1. Font, TextBox1. Style Or FontStyle.
Bold Else TextBox1. Style And Not FontStyle. Bold End If End Sub. EventArgs Handles CheckBox2. CheckedChanged If CheckBox2. Italic Else TextBox1. EventArgs Handles CheckBox3. Underline Else TextBox1. The statement TextBox1. Italic will retain the original font type but change it to italic font style. Here is an example which allows the user to select one color only.
While the checkboxes work independently and allow the user to select one or more items. Using Radio Button in Visual Basic The Code: In Example EventArgs Handles RadioYellow. Click Label2. Only the radio buttons inside the Groupbox are mutually exclusive. EventArgs Handles RadioButton7. After inserting the Groupbox into the form. This is easily achieved in Visual Basic by using the Groupbox control under the containers categories. EventArgs Handles RadioButton EventArgs Handles RadioYellow..
EventArgs Handles RadioButton8. EventArgs Handles RadioM. EventArgs Handles RadioL. EventArgs Handles RadioS.. First of all. In this chapter.. I will show you how to create a simple web browser and get it running in a few minutes. Opera and the latest Chrome created by Google. Here I am just using the name Web Browser.
The design interface is shown below: The code for the web browser is surprisingly simple, it is only a single line code! Double click on the Go button and key in the following code: Click MyWebBrowser.
Navigate TextBox1. You will be able to browse any web page you want. Figure The Runtime Interface. November 20, at Navigate yourtextboxname. VB has improved a lot in its built-in errors handling capabilities compared to Visual Basic 6. Errors Handling in Visual Basic Vis. An error-free program can run smoothly and efficiently.
Errors often occur due to incorrect input from the user.
These errors are known as synchronous errors. Writing errors handling code is a good practice for Visual Basic programmers. Therefore a good programmer should be more alert to the parts of program that could trigger errors and should write errors handling code to help the user in managing the errors. Try it out yourself. We shall now learn how to write errors handling code in VB Although it has a more advanced error handling method.
Once an error is detected. Division by Zero In this example. Try again! EventArgs Handles CmdCalculate. If no error occurs.. End Try Structure VB has adopted a new approach in handling errors. It is supposed to be more efficient than the old On Error Goto method.
Instead of using On Error GoTo method. ByVal eAs System.. If there is no exception. Errors Handling in Visual Basic Vis.. Even though the learning curve is steeper. In Visual Basic 6. Visual Basic is much more versatile in handling graphics. Managing Graphics 1-Basic ConceptsVis.. Now the programmer needs to write code to create various shapes and drawings.
You can even design your own controls Visual Basic offers various graphics capabilities that enable programmers to write code that can draw all kinds of shapes and even fonts. Or if you want the graphics object to draw to a picturebox. You can also create a Pen using the following statement: The first argument of the pen object define the color of the drawing line and the second argument define the width of the drawing line..
CreateGraphics You can also use the text box as a drawing surface. CreateGraphics The Graphics object that is created does not draw anything on the screen until you call the methods of the Graphics object. A graphics object is created using a CreateGraphics method. Managing Graphics 1-Basic ConceptsVis.
You can use any variable name instead of myPen. In addition. We will examine the code that can create a pen in the following section. Using me instead of Form1 because it is not allowed in Visual Basic You can create a graphics object that draw to the form itself or a control.
The first argument use the Pen object created by you. DrawLine myPen. Having created the Graphics and the Pen objects. In the startup page. The fifth draw a line on the Form using the DrawLine method.
Double click on the button and key in the following code. The general syntax of the Drawline argument is object. DrawLine Pen. March 5. You also need to create a Graphics and a Pen object to handle the actual drawing.
You can use any valid and meaningful variable names. Now we shall learn how to draw various shapes such as rectangle. Y is the coordinate of the upper left corner of the rectangle while width and height are self-explanatory. The method to draw the rectangle is DrawRectangle. DrawRectangle myPen. Managing Graphics -Drawing Rectangle. The sample code is shown below: The syntax is: This ebook is a quick introduction to VB. NET programming language. It explains the very basics of the language with screenshots showing what is expected to see during development process.
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