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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)

member Replace : 
        oldValue:string * 
        newValue:string -> string

Parameters

oldValue
Type: System.String

The string to be replaced.

newValue
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.

ExceptionCondition
ArgumentNullException

oldValue is a null reference (Nothing in Visual Basic).

ArgumentException

oldValue is the empty string ("").

If newValue is a null reference (Nothing in Visual Basic), all occurrences of oldValue are removed.

NoteNote

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.

Because this method returns the modified string, you can chain together successive calls to the Replace method to perform multiple replacements on the original string. Method calls are executed from left to right. The following example provides an illustration.

No code example is currently available or this language may not be supported.

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

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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