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VB.Net program to demonstrate the IsNullorWhitSpace() method of String class

Here, we are going to demonstrate the IsNullorWhitSpace() method of String class in VB.Net.
Submitted by Nidhi, on January 20, 2021 [Last updated : March 07, 2023]

String.IsNullorWhitSpace() Method in VB.Net

The IsNullorWhitSpace() method is used to check the specified string contains null or only whitespace.

Syntax

Function IsNullorWhitSpace(ByVal str as String) as Boolean

Parameter(s)

• Str: Specified string to be checked.

Return Value

It returns the Boolean value, it returns true when the specified string contains null or only whitespace. Otherwise, it will return false.

VB.Net code to demonstrate the example of String.IsNullorWhitSpace() method

The source code to demonstrate the IsNullorWhitSpace() method of the String class is given below. The given program is compiled and executed successfully.

'VB.NET program to demonstrate the IsNullOrWhiteSpace() method 
'of String class.

Imports System

Module Module1
    Sub Main()
        Dim str1 As String = " "
        Dim str2 As String = "Hello World"
        Dim ret As Boolean

        ret = String.IsNullOrWhiteSpace(str1)

        If ret = True Then
            Console.WriteLine("Strings str1 contains Null or only Whitespace")
        Else
            Console.WriteLine("Strings str1 does not contain Null or only Whitespace")
        End If

        ret = String.IsNullOrWhiteSpace(str2)
        If ret = True Then
            Console.WriteLine("Strings str2 contains Null or only Whitespace")
        Else
            Console.WriteLine("Strings str2 does not contain Null or only  Whitespace")
        End If
    End Sub
End Module

Output

Strings str1 contains Null or only Whitespace
Strings str2 does not contain Null or only  Whitespace
Press any key to continue . . .

Explanation

In the above program, we created a module Module1 that contains the Main() function. The Main() function is the entry point for the program.

In the Main() function, we created two strings str1 and str2. Here, we check the string contains null or only whitespace using the IsNullOrWhiteSpace() method of String class and then printed the appropriate message on the console screen.

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