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File.Copy Method (String, String)

Copies an existing file to a new file. Overwriting a file of the same name is not allowed.

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

public static void Copy (
	string sourceFileName,
	string destFileName
)
public static void Copy (
	String sourceFileName, 
	String destFileName
)
public static function Copy (
	sourceFileName : String, 
	destFileName : String
)
Not applicable.

Parameters

sourceFileName

The file to copy.

destFileName

The name of the destination file. This cannot be a directory or an existing file.

Exception typeCondition

UnauthorizedAccessException

The caller does not have the required permission.

ArgumentException

sourceFileName or destFileName is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.

-or-

sourceFileName or destFileName specifies a directory.

ArgumentNullException

sourceFileName or destFileName is a null reference (Nothing in Visual Basic).

PathTooLongException

The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.

DirectoryNotFoundException

The path specified in sourceFileName or destFileName is invalid (for example, it is on an unmapped drive).

FileNotFoundException

sourceFileName was not found.

IOException

destFileName exists.

-or-

An I/O error has occurred.

NotSupportedException

sourceFileName or destFileName is in an invalid format.

This method is equivalent to the Copy(String,String,Boolean) method overload with the overwrite parameter set to false.

The sourceFileName and destFileName arguments are permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.

For a list of common I/O tasks, see Common I/O Tasks.

The following example copies a file to the specified path, not allowing the overwriting of a target file of the same name.

using System;
using System.IO;

class Test 
{
    public static void Main() 
    {
        string path = @"c:\temp\MyTest.txt";
        string path2 = path + "temp";

        try 
        {
            using (FileStream fs = File.Create(path)) {}
            // Ensure that the target does not exist.
            File.Delete(path2);

            // Copy the file.
            File.Copy(path, path2);
            Console.WriteLine("{0} copied to {1}", path, path2);

            // Try to copy the same file again, which should fail.
            File.Copy(path, path2);
            Console.WriteLine("The second Copy operation succeeded, which was not expected.");
        } 

        catch (Exception e) 
        {
            Console.WriteLine("Double copying is not allowed, as expected.");
            Console.WriteLine(e.ToString());
        }
    }
}

import System.*;
import System.IO.*;

class Test
{
    public static void main(String[] args)
    {
        String path = "c:\\temp\\MyTest.txt";
        String path2 = path + "temp";

        try {
            FileStream fs = File.Create(path);
            try {
            }
            finally {
                fs.Dispose();
            }
            // Ensure that the target does not exist.
            File.Delete(path2);

            // Copy the file.
            File.Copy(path, path2);
            Console.WriteLine("{0} copied to {1}", path, path2);

            // Try to copy the same file again, which should fail.
            File.Copy(path, path2);
            Console.WriteLine("The second Copy operation succeeded, which " 
                + "was not expected.");
        }
        catch (System.Exception e) {
            Console.WriteLine("Double copying is not allowed, as expected.");
            Console.WriteLine(e.ToString());
        }
    } //main
} //Test

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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