Razor VB variables

ASP.NET Razor - VB Variables

Variables are named entities used to store data.

Variables

Variables are used to store data.

The name of a variable must start with an alphabetic character and cannot contain spaces or reserved characters.

A variable can be a specified type, indicating the type of data it stores. The string variable stores a string value ("Welcome to W3CSool.cc"), the integer variable stores a numeric value (103), the date variable stores a date value, and so on.

Variables are declared using the Dim keyword, or by using a type if you want to declare a type, but ASP.NET can usually determine the data type automatically.

Example

// Using the Dim keyword:
Dim greeting = "Welcome to W3CSchool.cc"
Dim counter = 103
Dim today = DateTime.Today

// Using data types:
Dim greeting As String = "Welcome to W3CSchool.cc"
Dim counter As Integer = 103
Dim today As DateTime = DateTime.Today

Data type

The following is a list of commonly used data types:

Type	Description	Instance
integer	Integer (all numbers)	103, 12, 5168
double	64-bit floating point number	3.14, 3.4e38
decimal	Decimal number (high precision)	1037.196543
boolean	Boolean value	true, false
string	string	"Hello W3CSschool.cc", "John"

Operators

Operators tell ASP.NET what commands to perform in an expression.

VB language supports multiple operators. Commonly used operators are listed below:

##+=Variable increment. i += 1##=<><>more than the. if i>10##&Connection string (a series of related things). "w3" & "schools".Dot mark. Separate objects and methods. DateTime.Hour()Parents. Group values. (i+5)()Parents. Pass parameters. x=Add(i,5)()Parents. Access the values of an array or collection. name(3)NotNot. True/false negation. if Not readyAndORAndAlsoorElse

Convert data types

It is sometimes useful to convert from one data type to another.

The most common example is converting a string input to another type, such as an integer or date.

Under general rules, user input is treated as a string, even if the user enters a number. Numeric inputs must therefore be converted into numbers before they can be used in calculations.

Commonly used conversion methods are listed below:

Operator	Description	Example
=	Assign a value to a variable.	i=6
+ - * /	plus a value or a variable . Subtract a value or a variable. Multiply a value or a variable. Divide by a value or variable.	i=5+5 i=5-5 i=5*5 i=5/5
-=	Variable is decremented.	i -= 1
are equal. Returns true if the values are equal.	if i=10
does not vary. Returns true if the values are not equal.	if <>10
<= >= is less than .	Less than or equal to. greater or equal to. if i<10	if i<=10 if i>=10






Logical AND. Logical OR.	if ready And clear if ready Or clear
Extended logical AND. Extended logical OR.	if ready AndAlso clear if ready OrElse clear

##AsFloat()Convert string to floating point number. if myString.IsFloat() thenAsDecimal()Convert string to decimal number. if myString.IsDecimal() then##AsDateTime()IsDateTime()myDate=myString.AsDateTime()AsBool()IsBool()myBool=myString.AsBool()ToString()myString=myInt.ToString()

Method	Description	Example
AsInt() IsInt()	Convert string to integer.	if myString.IsInt() then myInt=myString.AsInt() end if
IsFloat()		myFloat=myString.AsFloat() end if
IsDecimal()		myDec=myString.AsDecimal() end if
Convert string to ASP.NET DateTime type.	myString="10/10/2012"
Convert string to Boolean value.	myString="True"
Convert any data type to string.	myInt=1234

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