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ASP.NET Razor - VB Variables

Variables are named entities used to store data.

Variables

Variables are used to store data.

A variable name must start with a letter character and cannot contain spaces or reserved characters.

Example

Data Types

The following lists common data types:

Type Description Example
integer Whole numbers 103, 12, 5168
double 64-bit floating-point number 3.14, 3.4e38
decimal Decimal numbers (high precision) 1037.196543
boolean Boolean values true, false
string String of characters "Hello tutorialpro.org", "John"

Operators

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

VB supports various operators. The following lists common operators:

Operator Description Example
= Assigns a value to a variable. i=6
+ <br>- <br>* <br>/ <br> Adds a value or variable. <br>Subtracts a value or variable. <br>Multiplies a value or variable. <br>Divides a value or variable. i=5+5 <br>i=5-5 <br>i=5*5 <br>i=5/5
+= <br>-= Increments the variable. <br>Decrements the variable. i += 1 <br>i -= 1
= Equality. Returns true if values are equal. if i=10
<> Inequality. Returns true if values are not equal. if i<>10
< <br>> <br><= <br>>= Less than. <br>Greater than. <br>Less than or equal to. <br>Greater than or equal to. if i<10 <br>if i>10 <br>if i<=10 <br>if i>=10
& Concatenates strings. "w3" & "schools"
. Dot. Separates objects and methods. DateTime.Hour
() Parentheses. Groups values. (i+5)
() Parentheses. Passes parameters. x=Add(i,5)
() Parentheses. Accesses array or collection values. name(3)
Not Negation. Inverts true/false. if Not ready
And <br>OR Logical AND. <br>Logical OR. if ready And clear <br>if ready Or clear
AndAlso <br>orElse Extended logical AND. <br>Extended logical OR. if ready AndAlso clear <br>if ready OrElse clear

Converting Data Types

Converting from one data type to another can be useful.

Generally, user input is treated as a string, even if the user enters numbers. Therefore, numeric input must be converted to a number before it can be used in calculations.

The following lists common conversion methods:

Method Description Example
AsInt() <br>IsInt() Converts a string to an integer. if myString.IsInt() then <br>myInt=myString.AsInt() <br>end if
AsFloat() <br>IsFloat() Converts a string to a floating-point number. if myString.IsFloat() then <br>myFloat=myString.AsFloat() <br>end if
AsDecimal() <br>IsDecimal() Converts a string to a decimal number. if myString.IsDecimal() then <br>myDec=myString.AsDecimal() <br>end if
AsDateTime() <br>IsDateTime() Converts a string to an ASP.NET DateTime type. myString="10/10/2012" <br>myDate=myString.AsDateTime()
AsBool() <br>IsBool() Converts a string to a boolean value. myString="True" <br>myBool=myString.AsBool()
ToString() Converts any data type to a string. myInt=1234 <br>myString=myInt.ToString()
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