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StringBuilder.Replace Method (Char, Char, Int32, Int32)

Replaces, within a substring of this instance, all occurrences of a specified character with another specified character.

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

member Replace : 
        oldChar:char * 
        newChar:char * 
        startIndex:int * 
        count:int -> StringBuilder 


Type: System.Char
The character to replace.
Type: System.Char
The character that replaces oldChar.
Type: System.Int32
The position in this instance where the substring begins.
Type: System.Int32
The length of the substring.

Return Value

Type: System.Text.StringBuilder
A reference to this instance with oldChar replaced by newChar in the range from startIndex to startIndex + count -1.


startIndex + count is greater than the length of the value of this instance.


startIndex or count is less than zero.

The size of the StringBuilder is unchanged because characters are only replaced. This method is case-sensitive.

The following example demonstrates the Replace method.

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

.NET Framework

Supported in: 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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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