{"id":64005,"date":"2022-06-21T05:50:14","date_gmt":"2022-06-21T05:50:14","guid":{"rendered":"https:\/\/itsourcecode.com\/?p=64005"},"modified":"2023-11-21T03:11:47","modified_gmt":"2023-11-21T03:11:47","slug":"vb-net-variables","status":"publish","type":"post","link":"https:\/\/itsourcecode.com\/tutorials\/visual-basic-tutorial\/vb-net-variables\/","title":{"rendered":"VB.net Variables – Declaration and Initialization of Variables in VB"},"content":{"rendered":"\n

VB.net Variables<\/strong><\/h2>\n\n\n\n

A VB.net variables<\/strong> is nothing more than a name for a storage space that our programs can access. <\/p>\n\n\n\n

<\/p>\n\n\n\n

In VB.net<\/strong>, each variable has a type that governs the memory size and layout, the range of values that may be stored within that memory, and the set of operations that can be applied to the variable.<\/p>\n\n\n\n

<\/p>\n\n\n\n

A variable<\/strong> is used in VB.NET to store a value that can be used later in the program. We’ll learn how to declare and initialize variables in this section.<\/p>\n\n\n\n

<\/p>\n\n\n\n

What is a Variable in Visual Basic?<\/strong><\/h2>\n\n\n\n

A variable<\/strong> is a short name for the value of a specific data type that is stored in computer memory. <\/p>\n\n\n\n

<\/p>\n\n\n\n

Each variable in VB.net<\/strong> has a specific data type that determines its size<\/em><\/strong>, range<\/em><\/strong>, and fixed memory location<\/em><\/strong>. <\/p>\n\n\n\n

<\/p>\n\n\n\n

In any programming language, we can use variables to execute multiple operations and alter data values.<\/p>\n\n\n\n

<\/p>\n\n\n\n

The basic value types provided in VB.net<\/a><\/strong> can be categorized as:<\/p>\n\n\n\n

Type<\/th>Example<\/th><\/tr>
Integral types<\/td>SByte, Byte, Short, UShort, Integer, UInteger, Long, ULong and Char<\/td><\/tr>
Floating point types<\/td>Single and Double<\/td><\/tr>
Decimal types<\/td>Decimal<\/td><\/tr>
Boolean types<\/td>True or False values, as assigned<\/td><\/tr>
Date types<\/td>Date<\/td><\/tr><\/tbody><\/table>
Basic Value Types<\/em><\/strong><\/figcaption><\/figure>\n\n\n\n

VB.net also allows defining other value types of variables like Enum<\/strong> and reference types of variables like Class.<\/p>\n\n\n\n

<\/p>\n\n\n\n

VB.net Variables Declaration<\/strong><\/h2>\n\n\n\n

The declaration of a variable<\/strong> is simple and requires a variable name and data type followed by a Dim. A Dim is used in Class, Module, structure, Sub, and procedure<\/em><\/strong>.<\/p>\n\n\n\n

<\/p>\n\n\n\n

The syntax for variable declaration in VB.Net is:<\/strong><\/p>\n\n\n\n

'Syntax for variable declaration in VB.Net'\n\n[ < attributelist > ] [ accessmodifier ] [[ Shared ] [ Shadows ] | [ Static ]]\n[ ReadOnly ] Dim [ WithEvents ] variablelist\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
1. attributelist<\/strong><\/h3>\n\n\n\n
attributelist<\/em><\/strong> is a list of attributes that apply to the variable. Optional.<\/p>\n\n\n\n
<\/p>\n\n\n\n
2. accessmodifier<\/strong><\/h3>\n\n\n\n
accessmodifier<\/em><\/strong> defines the access levels of the variables, it has values as – Public, Protected, Friend, Protected Friend and Private. Optional.<\/p>\n\n\n\n
<\/p>\n\n\n\n
3. Shared<\/strong><\/h3>\n\n\n\n
Shared<\/em><\/strong> declares a shared variable, which is not associated with any specific instance of a class or structure, rather available to all the instances of the class or structure. Optional.<\/p>\n\n\n\n
<\/p>\n\n\n\n
4. Shadows<\/strong><\/h3>\n\n\n\n
Shadows<\/em><\/strong> indicate that the variable re-declares and hides an identically named element, or set of overloaded elements, in a base class. Optional.<\/p>\n\n\n\n
<\/p>\n\n\n\n
5. Static<\/strong><\/h3>\n\n\n\n
Static<\/em><\/strong> indicates that the variable will retain its value, even after termination of the procedure in which it is declared. Optional.<\/p>\n\n\n\n
<\/p>\n\n\n\n
6. ReadOnly<\/strong><\/h3>\n\n\n\n
ReadOnly<\/em><\/strong> means the variable can be read, but not written. Optional.<\/p>\n\n\n\n
<\/p>\n\n\n\n
7. WithEvents<\/strong><\/h3>\n\n\n\n
WithEvents<\/em><\/strong> specifies that the variable is used to respond to events raised by the instance assigned to the variable. Optional.<\/p>\n\n\n\n
<\/p>\n\n\n\n
8. Variablelist<\/strong><\/h3>\n\n\n\n
Variablelist<\/em><\/strong> provides the list of variables declared.<\/p>\n\n\n\n
Each variable in the variable list has the following syntax and parts<\/strong>:<\/p>\n\n\n\n
'syntax for each variable in the variable list'\n\nvariablename[ ( [ boundslist ] ) ] [ As [ New ] datatype ] [ = initializer ]\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
variablename<\/strong><\/h4>\n\n\n\n
variablename<\/em><\/strong> \u2212 is the name of the variable.<\/p>\n\n\n\n
<\/p>\n\n\n\n
boundslist<\/strong><\/h4>\n\n\n\n
boundslist<\/em><\/strong> \u2212 optional. It provides list of bounds of each dimension of an array variable.<\/p>\n\n\n\n
<\/p>\n\n\n\n
New<\/strong><\/h4>\n\n\n\n
New<\/em><\/strong> \u2212 optional. It creates a new instance of the class when the Dim statement runs.<\/p>\n\n\n\n
<\/p>\n\n\n\n
datatype<\/strong><\/h4>\n\n\n\n
datatype<\/em><\/strong> \u2212 Required if Option Strict is On. It specifies the data type of the variable.<\/p>\n\n\n\n
<\/p>\n\n\n\n
initializer<\/strong><\/h4>\n\n\n\n
initializer<\/em><\/strong> \u2212 Optional if New is not specified. An expression that is evaluated and assigned to the variable when it is created.<\/p>\n\n\n\n
<\/p>\n\n\n\n
Some valid variable declarations along with their definition are shown here:<\/strong><\/p>\n\n\n\n
'variable declarations along with their definition'\n\nDim StudentID As Integer\nDim StudentName As String\nDim Salary As Double\nDim count1, count2 As Integer\nDim status As Boolean\nDim exitButton As New System.Windows.Forms.Button\nDim lastTime, nextTime As Date\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
Variable Initialization in VB.net<\/strong><\/h2>\n\n\n\n
Variables in VB.net<\/strong> are initialized (assigned a value) with an equal sign followed by a constant expression. <\/p>\n\n\n\n
The general form of initialization is:<\/p>\n\n\n\n
\/\/general form of initialization\n\nvariable_name = value;\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
For example:<\/strong><\/p>\n\n\n\n
'variable initialization'\n\nDim pi As Double\npi = 3.14159\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
You can initialize a variable at the time of declaration as follows:<\/p>\n\n\n\n
'initializing the variable at the time'\n\nDim StudentID As Integer = 100\nDim StudentName As String = \"Angel Jude Suarez\"\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
Example Code for the various VB.net Variable Types<\/strong><\/h2>\n\n\n\n
Try the following example which makes use of various vb.net types of variable<\/strong><\/p>\n\n\n\n
'following example of various types of variables'\n\nModule variablesNdataypes\n   Sub Main()\n      Dim a As Short\n      Dim b As Integer\n      Dim c As Double\n      \n      a = 10\n      b = 20\n      c = a + b\n      Console.WriteLine(\"a = {0}, b = {1}, c = {2}\", a, b, c)\n      Console.ReadLine()\n   End Sub\nEnd Module\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
When the above code is compiled and executed, it produces the following result:<\/p>\n\n\n\n
a = 10, b = 20, c = 30<\/p>\n\n\n\n
<\/p>\n\n\n\n
You can test the above example here! \u27a1 VB.net Online Compiler<\/a><\/strong><\/p>\n\n\n\n
<\/p>\n\n\n\n
Accepting Values from User<\/strong><\/h2>\n\n\n\n
The Console class in the System namespace provides a function ReadLine<\/strong> for accepting input from the user and storing it into a variable.<\/p>\n\n\n\n
For example:<\/strong><\/p>\n\n\n\n
'accepting user input'\n\nDim message As String\nmessage = Console.ReadLine\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
The following example demonstrates it:<\/p>\n\n\n\n
\nModule variablesNdataypes\n   Sub Main()\n      Dim message As String\n      Console.Write(\"Enter message: \")\n      message = Console.ReadLine\n      Console.WriteLine()\n      Console.WriteLine(\"Your Message: {0}\", message)\n      Console.ReadLine()\n   End Sub\nEnd Module\n<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
When the above code is compiled and executed, it produces the following result (assume the user inputs Hello IT SOURCECODERS!)<\/p>\n\n\n\n
Enter message: Hello IT SOURCECODERS!
Your Message: Hello IT SOURCECODERS!<\/p>\n\n\n\n
<\/p>\n\n\n\n
You can test the above example here! \u27a1 VB.net Online Compiler<\/a><\/strong><\/p>\n\n\n\n
<\/p>\n\n\n\n
Lvalues and Rvalues<\/strong><\/h2>\n\n\n\n
There are two kinds of expressions:<\/p>\n\n\n\n
<\/p>\n\n\n\n
1. lvalue<\/strong><\/h3>\n\n\n\n
lvalue<\/em><\/strong> \u2212 An expression that is an lvalue may appear as either the left-hand or right-hand side of an assignment.<\/p>\n\n\n\n
<\/p>\n\n\n\n
2. rvalue<\/strong><\/h3>\n\n\n\n
rvalue<\/em><\/strong> \u2212 An expression that is an rvalue may appear on the right- but not the left-hand side of an assignment.<\/p>\n\n\n\n
<\/p>\n\n\n\n
Variables<\/strong> are lvalues<\/strong> and so may appear on the left-hand side of an assignment. Numeric literals are rvalues<\/strong> and so may not be assigned and can not appear on the left-hand side.<\/p>\n\n\n\n
<\/p>\n\n\n\n
Following is a valid statement:<\/strong><\/p>\n\n\n\n
Dim g As Integer = 20<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
But the following is not a valid statement and would generate a compile-time error<\/p>\n\n\n\n
20 = g<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
Summary<\/strong><\/h2>\n\n\n\n
In this tutorial we’ve successfully discussed the VB.net Variables and how to declare a variable in a program, also we discussed how to store any data type Data in a variable name.<\/p>\n\n\n\n
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PREVIOUS<\/strong><\/p>\n\n\n\n
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NEXT <\/strong><\/p>\n\n\n\n
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Constants<\/mark><\/a><\/strong><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
VB.net Variables A VB.net variables is nothing more than a name for a storage space that our programs can access. In VB.net, each variable has a type that governs the … <\/p>\n
Read more<\/a><\/p>\n","protected":false},"author":1767,"featured_media":64169,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[79986,79983,79988,79984,79987,79982,79990,79991,79985,79989],"class_list":["post-64005","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-visual-basic-tutorial","tag-how-to-declare-a-variable-in-vb-net","tag-how-to-declare-global-variable-in-vb-net","tag-object-variable-or-with-block-variable-not-set-vb-net","tag-variable-declaration-in-vb-net","tag-variable-in-vb-net-in-hindi","tag-variables-in-vb-net-2","tag-vb-net-environment-variables","tag-vb-net-public-variable","tag-vb-net-session-variable","tag-what-is-variable-in-vb-net","resize-featured-image"],"yoast_head":"\nVB.net Variables - Declaration and Initialization of Variables in VB<\/title>\n<meta name=\"description\" content=\"Learn on How To Declare a VB.net Variable, In this tutorial you can learn on how to store the Data in a Variable name using Visual Basic...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itsourcecode.com\/tutorials\/visual-basic-tutorial\/vb-net-variables\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VB.net Variables - 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