File.Copy Method (String, String)

July 28, 2014

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
)

Parameters

sourceFileName
Type: System.String
The file to copy.
destFileName
Type: System.String
The name of the destination file. This cannot be a directory or an existing file.

ExceptionCondition
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 GetInvalidPathChars.

-or-

sourceFileName or destFileName specifies a directory.

ArgumentNullException

sourceFileName or destFileName is null.

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.

Version Notes

Windows Phone

 This member has a SecurityCriticalAttribute attribute. This attribute restricts this member to internal use. Application code that uses this member throws a MethodAccessException.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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