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String.Replace Method (String, String)

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

Public Function Replace ( _
	oldValue As String, _
	newValue As String _
) As String


Type: System.String

The string to be replaced.

Type: System.String

The string to replace all occurrences of oldValue.

Return Value

Type: System.String
A string that is equivalent to the current string except that all instances of oldValue are replaced with newValue. If oldValue is not found in the current instance, the method returns the current instance unchanged.


oldValue is Nothing.


oldValue is the empty string ("").

If newValue is Nothing, all occurrences of oldValue are removed.


This method does not modify the value of the current instance. Instead, it returns a new string in which all occurrences of oldValue are replaced by newValue.

This method performs an ordinal (case-sensitive and culture-insensitive) search to find oldValue.

The following example demonstrates how you can use the Replace method to correct a spelling error.

Imports System

Public Class ReplaceTest

    Public Shared Sub Main()
        Dim errString As String = "This docment uses 3 other docments to docment the docmentation"

        Console.WriteLine("The original string is:{0}'{1}'{0}", Environment.NewLine, errString)

        ' Correct the spelling of "document".   
        Dim correctString As String = errString.Replace("docment", "document")

        Console.WriteLine("After correcting the string, the result is:{0}'{1}'", Environment.NewLine, correctString)
    End Sub 
End Class 

' This code example produces the following output: 

' The original string is: 
' 'This docment uses 3 other docments to docment the docmentation' 

' After correcting the string, the result is: 
' 'This document uses 3 other documents to document the documentation' 

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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