VB.NET Replace() – Code Sample

Posted by on Tuesday, February 8, 2011 · Leave a Comment 

VB.NET Replace Example – Code Sample Syntax

Abstract: – Illustrates using .

 *** 1. Download Source Code *** 
VB.NET Syntax StringManipulation Replace 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. Replace Syntax *** 


Purpose:
Returns a string with all occurrences of the old string in the string
replaced by the new string.


Syntax:
Replace(string, oldstring, newstring)

Parameters Description
string Required – string – that you use as the source
for having all occurrences of oldstring replaced with newstring
oldstring Required – string that you want to search
for so you can replace all occurrences of it.
newstring Required – string that you want to replace
the oldstring with.

Result Data Type Description
string Returns a string with all occurrences of the old string in the string
replaced by the new string.


 *** 3. Replace – Quick Example *** 
Dim strField As String = “This is my string”
Dim strOldField As String = “my”
Dim strNewField As String = “your”
Console.WriteLine(Replace(strField, strOldField, strNewField)) ‘Returns This is your string

 *** 4. Replace – Full Example *** 

Replace Example Output Screenshot


VB.NET Syntax StringManipulation Replace screenshot


Step 1: Click Visual Basic to Cut-n-paste code into clsReplace.vb

Public Class clsReplace
 
    Public Sub Main()
 
        '****************************************************************************************
        ' Purpose:  Returns a string with all occurrences of the old string in the string
        ' replaced by the new string.
        '
        ' Syntax: 	Replace(string, oldstring, newstring)
        '
        ' Parameter1: string - Required - string - that you use as the source
        ' for having all occurrences of oldstring replaced with newstring
        '
        ' Parameter2: oldstring - Required - string that you want to search
        ' for so you can replace all occurrences of it.
        '
        ' Parameter3: newstring - Required - string that you want to replace
        ' the oldstring with.
        '
        ' Result: string -  Returns a string with all occurrences of the old string in the string
        ' replaced by the new string.
        '
        ' Quick Example:      Dim strField As String = "This is my string"
        ' Dim strOldField As String = "my"
        ' Dim strNewField As String = "your"
        ' Console.WriteLine(Replace(strField, strOldField, strNewField)) 'Returns This is your string
        '
        '****************************************************************************************
 
        '****************************************************************************************
        ' Example #1: Replace(string, oldstring, newstring)
        ' Returns a string with all occurrences of the old string in the string
        ' replaced by the new string.
        '****************************************************************************************
 
        Console.WriteLine("Example #1: Replace(strField, strOldField, strNewField)")
 
        Dim strField As String = "This is my string"
        Dim strOldField As String = "my"
        Dim strNewField As String = "your"
 
        Console.WriteLine(Replace(strField, strOldField, strNewField)) 'Returns This is your string
 
        '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

Module Module1
 
    Sub Main()
 
 
        Dim myclsReplace As New clsReplace
        myclsReplace.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 Replace

  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 clsReplace to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select class
    • Class name could be clsReplace
  5. Click on Visual Basic in code in step 1 above to copy code into clsReplace.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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