This documentation is archived and is not being maintained.

String.Copy Method

Creates a new instance of String with the same value as a specified String.

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

public static string Copy(
	string str


Type: System.String

The String to copy.

Return Value

Type: System.String
A new String with the same value as str.


str is null.

The following example displays two dissimilar strings referenced by two variables, creates a copy of the first string, assigns a reference to the new string to the second variable, then displays the two strings referenced by the variables to demonstrate that the strings are now identical.

// Sample for String.Copy() 
using System;

class Sample {
    public static void Main() {
    string str1 = "abc";
    string str2 = "xyz";
    Console.WriteLine("1) str1 = '{0}'", str1);
    Console.WriteLine("2) str2 = '{0}'", str2);
    str2 = String.Copy(str1);
    Console.WriteLine("3) str1 = '{0}'", str1);
    Console.WriteLine("4) str2 = '{0}'", str2);
This example produces the following results:
1) str1 = 'abc'
2) str2 = 'xyz'
3) str1 = 'abc'
4) str2 = 'abc'

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0