VB.NET String.IsNullorEmpty()

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VB.NET StringIsNullorEmpty Example – Code Sample Syntax

Abstract: – Illustrates using .


 *** 1. Download Source Code *** 

VB.NET Syntax StringManipulation StringIsNullorEmpty download Download Source Code for All VB Console Examples in One Project – source code for hundreds of VB.NET console examples neatly organized in a single project.


 *** 2. StringIsNullorEmpty Syntax *** 


Purpose:
Returns a Boolean value that indicates if the string is Null or Empty.


Syntax:
String.IsNullorEmpty(stringtocheck)

Parameters Description
stringtocheck Required – string that you want to check
whether it is null or empty

Result Data Type Description
Boolean Returns a Boolean value that indicates if the string is Null or Empty.



 *** 3. StringIsNullorEmpty – Quick Example *** 

Dim strIsNullorEmptyExample As String = "This is a test string"
Console.WriteLine(String.IsNullOrEmpty(strIsNullorEmptyExample)) 'Returns False


 *** 4. StringIsNullorEmpty – Full Example *** 

StringIsNullorEmpty Example Output Screenshot


VB.NET Syntax StringManipulation StringIsNullorEmpty screenshot


Step 1: Click Visual Basic to Cut-n-paste code into clsStringIsNullorEmpty.vb
 Visual Basic |  copy code |? 
Public Class clsStringIsNullorEmpty
 
    Public Sub Main()
 
        '****************************************************************************************
        ' Purpose: Returns a Boolean value that indicates if the string is Null or Empty. 
        '
        ' Syntax: 	String.IsNullorEmpty(stringtocheck)
        '
        ' Parameter1: stringtocheck - Required - string that you want to check
        ' whether it is null or empty
        '
        ' Result: Boolean -  Returns a Boolean value that indicates if the string is Null or Empty. 
        '
        ' Quick Example:      Dim strIsNullorEmptyExample As String = "This is a test string"
        ' Console.WriteLine(String.IsNullOrEmpty(strIsNullorEmptyExample)) 'Returns False
        '
        '****************************************************************************************
 
        '****************************************************************************************
        ' Example #1: String.IsNullorEmpty(string)
 
        '****************************************************************************************
 
 
        '****************************************************************************************
        ' Example #1: String.IsNullorEmpty(string)
        ' Returns a Boolean value that indicates if the string is Null or Empty. 
        '****************************************************************************************
 
        Console.WriteLine("Example #1: String.IsNullorEmpty ")
 
        Dim strIsNullorEmptyExample As String = "This is a test string"
 
        Console.WriteLine(String.IsNullOrEmpty(strIsNullorEmptyExample)) 'Returns False
 
        'write blank line to make output easier to read
        Console.WriteLine()
 
 
 
        'Prevent console from closing before you press enter
        Console.ReadLine()
 
    End Sub
 
 
End Class
 
 

Step 2: Click Visual Basic to Cut-n-paste code into Module1.vb
 Visual Basic |  copy code |? 
Module Module1
 
    Sub Main()
 
 
        Dim myclsStringIsNullorEmpty As New clsStringIsNullorEmpty
        myclsStringIsNullorEmpty.Main()
 
 
 
    End Sub
 
End Module
 
 
 
 

Prerequistes:

  1. Install Visual Basic (Express or Standard Edition)
  2. Install SQL Server Express
  3. Download Northwind and pubs Database
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
  • You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb

Instructions:
VB.NET Syntax StringManipulation StringIsNullorEmpty

  1. Use Visual Basic 2010 Express or Standard Edition
  2. Create new project;
    • Click File/New Project
    • Select Console Application Template
    • Select Visual Basic for Language
    • name of project could be VBNET_Syntax.
  3. Add New folder named "StringManipulation"
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: StringManipulation
  4. Add Class Named clsStringIsNullorEmpty to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select class
    • Class name could be clsStringIsNullorEmpty
  5. Click on Visual Basic in code in step 1 above to copy code into clsStringIsNullorEmpty.vb
  6. Click on Visual Basic in code in step 2 above to copy code into Module1.vb
  7. Click green arrow or press F5 to run program

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