46 Chapter 2 Creating Applications with Visual Basic Tutorial 2-2: Adding a Label control to the Directions application Step 1: Now you are ready to add the Label control to the form. Make sure the Com- mon Controlstab is open in the Toolbox window, as shown in Figure 2-5, and double-click the Label control icon.The label appears on the form with a dot-ted line around it and a small white. Simple Calculator in (VB) Visual Basic with Source Code. 2 weeks ago By Allaoui. This is a Sample calculator that I created in visual basic 2008, and this sample will be more useful for learners who are interested in VB 2008 and fortunately the VS 2019 can upgrade the source code perfectly. You can study it and modify it as more as you like.
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Visual Basic Concepts Designing a Form Form objects are the basic building blocks of a Visual Basic application, the actual windows with which a user interacts when they run the application. Forms have their own properties, events, and methods with which you can control their appearance and behavior. Knowledge of programming, electronics, Visual Basic or the Visual Studio environment. Programming concepts are introduced and explained throughout the book. Each chapter is structured in a similar way: firstly a new concept to be learned is introduced, secondly there is a step-by-step tutorial on how to develop a simple example in.
-->The syntax in a Visual Basic Help topic for a method, function, or statement shows all the elements necessary to use the method, function, or statement correctly. The examples in this topic explain how to interpret the most common syntax elements.
Activate method syntax
object.Activate
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In the Activate method syntax, the italic word 'object' is a placeholder for information you supply—in this case, code that returns an object. Words that are bold should be typed exactly as they appear. For example, the following procedure activates the second window in the active document.
MsgBox function syntax
MsgBox (prompt, [ buttons, ] [ title, ] [ helpfile, context ])
In the MsgBox function syntax, the italic words are named arguments of the function. Arguments enclosed in brackets are optional. (Do not type the brackets in your Visual Basic code.) For the MsgBox function, the only argument you must provide is the text for the prompt.
Arguments for functions and methods can be specified in code either by position or by name. To specify arguments by position, follow the order presented in the syntax, separating each argument with a comma, for example:
To specify an argument by name, use the argument name followed by a colon and an equal sign (:=), and the argument's value. You can specify named arguments in any order, for example:
The syntax for functions and some methods shows the arguments enclosed in parentheses. These functions and methods return values, so you must enclose the arguments in parentheses to assign the value to a variable. If you ignore the return value or if you don't pass arguments at all, don't include the parentheses. Methods that don't return values do not need their arguments enclosed in parentheses. These guidelines apply whether you are using positional arguments or named arguments.
In the following example, the return value from the MsgBox function is a number indicating the selected button that is stored in the variable myVar. Because the return value is used, parentheses are required. Another message box then displays the value of the variable.
Option Compare statement syntax
Option Compare { Binary | Text | Database }
In the Option Compare statement syntax, the braces and vertical bar indicate a mandatory choice between three items. (Do not type the braces in the Visual Basic statement). For example, the following statement specifies that within the module, strings will be compared in a sort order that is not case-sensitive.
Dim statement syntax
Dimvarname [([ subscripts ])] [ Astype, ] [ varname [([ subscripts ])] [ Astype ]] . . .
In the Dim statement syntax, the word Dim is a required keyword. The only required element is varname (the variable name).
For example, the following statement creates three variables: myVar, nextVar, and thirdVar. These are automatically declared as Variant variables.
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The following example declares a variable as a String. Including a data type saves memory and can help you find errors in your code.
To declare several variables in one statement, include the data type for each variable. Variables declared without a data type are automatically declared as Variant.
In the following statement, x and y are assigned the Variant data type. Only z is assigned the Integer data type.
The shorthand to declare x and y as Integer in the statement above is:
The shorthand for the types is: % -integer; & -long; @ -currency; # -double; ! -single; $ -string
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If you are declaring an array variable, you must include parentheses. The subscripts are optional. The following statement dimensions a dynamic array, myArray.
See also
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