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