VB.NET Data Types DATATYPE in a programming language describes that what type of data a variable can hold . When we declare a variable, we have to tell the compiler about what type of the data the variable can hold or which data type the variable belongs to. Syntax : Dim VariableName as DataType VariableName : the variable we declare for hold the values. DataType : The type of data that the variable can hold VB.NET sample : Dim count As Integer count : is the variable name Integer : is the data type The above example shows , declare a variable count for holding integer values. In the variable count we can hold the integer values in the range of -2,147,483,648 to +2,147,483,647. The follwing are the some of commonly using datatypes in vb.net. Boolean Boolean variables are stored 16 bit numbers and it can hold only True or false. VB.NET Runtime type : System.Boolean VB.NET declaration : dim check as Boolean VB.NET Initialization : check = false VB.NET default initialization value : false Integer Integer variables are stored sighned 32 bit integer values in the range of -2,147,483,648 to +2,147,483,647 VB.NET Runtime type : System.Int32 VB.NET declaration : dim count as Integer VB.NET Initialization : count = 100 VB.NET default initialization value : 0 String String variables are stored any number of alphabetic, numerical, and special characters . Its range from 0 to approximately 2 billion Unicode characters. VB.NET Runtime type : System.String VB.NET declaration : Dim str As String VB.NET Initialization : str = String Test VB.NET default initialization value : Nothing In VisualBasic.Net we can convert a datatype in two ways. Implicit Conversion and Explicit conversion . Also we can convert a type value to a reference and reference value to a type value. These are called Boxing and unBoxing . Boxing referes value type to reference type and unboxing , reference type ot value type. Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim check As Boolean check = True MsgBox(The value assigned for check is : & check) Dim count As Integer count = 100 MsgBox(The value holding count is : & count) Dim str As String str = String test MsgBox(The value holding str is : & str) End Sub End Class
Posted on: Sat, 17 Jan 2015 07:29:27 +0000
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