C# File Operations
The .Net Framework Class Library is the most important part of the .NET Framework. The class library comes built in with all the code your application needs to create Windows forms, perform input and output (IO) operations, manage security, and many more.
The System.IO namespaces contain types that support input and output, including the ability to read and write data to streams either synchronously or asynchronously. From the following C# chapters you can see more operations in System.IO namespaces.