The System.IO namespace provides several classes that allow for various actions, such as reading and writing, to be performed on files, directories, and streams. For more information, see File and Stream I/O.
To do this...
See the example in this topic...
Create a text file.
System.IO..::.File
Write to a text file.
How to: Write Text to a File
Read from a text file.
How to: Read Text from a File
Append text to a file.
How to: Open and Append to a Log File
File..::.AppendText
FileInfo..::.AppendText
Rename or move a file.
File..::.Move
FileInfo..::.MoveTo
Delete a file.
File..::.Delete
FileInfo..::.Delete
Copy a file.
File..::.Copy
FileInfo..::.CopyTo
Get the size of a file.
FileInfo..::.Length
Get the attributes of a file.
File..::.GetAttributes
Set the attributes of a file.
File..::.SetAttributes
Determine whether a file exists.
File..::.Exists
Read from a binary file.
How to: Read and Write to a Newly Created Data File
Write to a binary file.
Retrieve a file extension.
Path..::.GetExtension
Retrieve the fully qualified path of a file.
Path..::.GetFullPath
Retrieve the file name and extension from a path.
Path..::.GetFileName
Change the extension of a file.
Path..::.ChangeExtension
Rename or move a directory.
Directory..::.Move
DirectoryInfo..::.MoveTo
Copy a Directory
How to: Copy Directories
Delete a directory.
Directory..::.Delete
DirectoryInfo..::.Delete
Create a directory.
Directory..::.CreateDirectory
FileInfo..::.Directory
Create a subdirectory.
DirectoryInfo..::.CreateSubdirectory
See the files in a directory.
FileInfo..::.Name
See the subdirectories of a directory.
Directory..::.GetDirectories
DirectoryInfo..::.GetDirectories
See all the files in all subdirectories of a directory.
DirectoryInfo..::.GetFileSystemInfos
Find the size of a directory.
System.IO..::.Directory
Determine whether a directory exists.
Directory..::.Exists
