Methods to convert data types in VB.NET

In this article I will explain your about the Methods to convert data types in VB.NET
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.NET provide two ways to convert on data type to another in VB.NET.

  • ToString and Parse method
  • Convert class
ToString and Parse method

ToString method lets you convert any value to a string. 

The Parse method is a shared method that performs the reverse operation of the ToString method. 

It converts other a string value to another data type.

Practical demonstration of parsing 


Module
 Module1
    Sub Main()
        Dim number As Integer
        Dim weight As 
Decimal

        Console.Write("Enter any number : ")
        number = Integer.Parse(Console.ReadLine())
        Console.Write("Enter your weight : ")
        weight = Decimal.Parse(Console.ReadLine())
        Console.WriteLine("You have entered : " & number)
        Console.WriteLine("You weight is : " & weight)
        Console.ReadLine()
    End 
Sub

End
 Module

The following table shows Common methods for data conversion 

 

Method

Description

toString

A method that converts the value to its equivalent string representation using the specified format. If the format is omitted, the value isn't formatted.

Parse

A Shared method that converts the specified string to an equivalent data value.


Convert Class

The Convert class provides shared methods that you can use to convert value with any data type to any other data type. 

Practical demonstration of Convert class 

Module Module1
    Sub Main()
        Dim num As String = "23"
        Dim number As Integer = Convert.ToInt32(num)
        Dim age As Integer = 45
        Dim vote As String = Convert.ToString(age)
        Console.WriteLine("Your number is : " & number)
        Console.WriteLine("Your voting age is : " & age)
        Console.ReadLine()
    End Sub

End Module

When you use convert class, you should realize that the result of the conversion would vary depending on the type of conversion that you perform. For example if you try to a Decimal to an Integer the conversion will round the decimal digits.

Using this class can do most of the common conversions. Some of the shared methods of the Convert class:
 

 

Method

Description

ToBoolean

Overloaded. Converts a value to a Boolean value.

ToByte

Overloaded. Converts a value to an 8-bit unsigned integer.

ToChar

Overloaded. Converts a value to a unicode character.

ToDateTime

Overloaded. Converts a value to a DateTime.

ToDecimal

Overloaded. Converts a value to a Decimal.

ToDouble

Overloaded. Returns the specified parameter as an 8-byte Double precision floating-point number.

ToInt16

Overloaded. Converts a value to a 16-bit signed integer.

ToInt32

Overloaded. Converts a value to a 32-bit signed integer.

ToInt64

Overloaded. Converts a value to a 64-bit signed integer.

ToSByte

Overloaded. Converts a value to an 8-bit signed integer.

ToSingle

Overloaded. Converts a value to a single-precision floating-point number.

ToString

Overloaded. Converts a value to a string.

ToUInt16

Overloaded. Converts a value to a 16-bit unsigned integer.

ToUInt32

Overloaded. Converts a value to a 32-bit unsigned integer.

ToUInt64

Overloaded. Converts a value to a 64-bit unsigned integer.


Important points:
  • The ToString and Parse methods are included in all of the data structure.
  • In some situations where a string is expected, the compiler will automatically call the ToString method.
  • The Convert class contains shared methods for converting all of the built-in-types.
Conclusion:

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