| Class | Description |
|---|
| BinaryReader | It is used to read primitive data types as binary values in a specific encoding. |
| BinaryWriter | It is used to write primitive types in binary to a stream. |
| BufferedStream | It is used to add a buffering layer to read and write operations on another stream. It is a sealed class. |
| Directory | It is used to expose static methods for creating, moving and enumerating through directories and subdirectories. It is a sealed class. |
| DirectoryInfo | It is used to expose instance methods for creating, moving and enumerating through directories and subdirectories. It is a sealed class. |
| DirectoryNotFoundException | It is used to handle exception related to the file or directory cannot be found. |
| DriveInfo | It is used to access the information on a drive. |
| DriveNotFoundException | It is used to handle drive not found exception. |
| EndOfStreamException | It is used to handle end of stream exception. |
| ErrorEventArgs | It provides data for the FileSystemWatcher.Error event. |
| File | This class provides static methods for the creation, copying, deletion, moving and opening of a single file. |
| FileFormatException | It is used to handle file format exception. |
| FileInfo | It is used to provide properties and instance methods for the creation, copying, deletion, moving and opening of files. |
| FileLoadException | It is used to handle file load exception. |
| FileNotFoundException | It is used to handle file load exception. |
| FileNotFoundException | It is used to handle file not found exception. |
| FileStream | It provides a Stream for a file, supporting both synchronous and asynchronous read and write operations. |
| FileSystemEventArgs | It provides data for the directory events. |
| FileSystemInfo | It provides the base class for both FileInfo and DirectoryInfo objects. |
| FileSystemWatcher | It listens to the file system change notifications and raises events when a directory or file in a directory, changes. |
| InternalBufferOverflowException | This class is used to handle internal buffer overflow exception. |
| InvalidDataException | It is used to handle invalid data exception. |
| IODescriptionAttribute | It sets the description visual designers can display when referencing an event, extender or property. |
| IOException | It is an exception class that handles I/O errors. |
| MemoryStream | It is used to create a stream whose backing store is memory. |
| Path | It performs operations on String instances that contain file or directory path information. |
| PathTooLongException | It is an exception class and used to handle path too long exception. |
| PipeException | This exception class is used to handle pipe related exception. |
| RenamedEventArgs | It is used to provide data for the Renamed event. |
| Stream | It is used to provide a generic view of a sequence of bytes. It is an abstract class. |
| StreamReader | It is used to implement a TextReader that reads characters from a byte stream. |
| StringReader | It is used to implement a TextReader that reads from a string. |
| StringWriter | It is used to implement a TextWriter for writing information to a string. The information is stored in an underlying StringBuilder. |
| TextReader | This class is used to represent a reader that can read a sequential series of characters. |
| TextWriter | This class is used to represent a writer that can write a sequential series of characters. |
| UnmanagedMemoryAccessor | It is used to provide random access to unmanaged blocks of memory from managed code. |
| UnmanagedMemoryStream | It is used to get access to unmanaged blocks of memory from managed code. |