مثال

using System.IO;  // include the System.IO namespace

string writeText = "Hello World!";  // Create a text string
File.WriteAllText("filename.txt", writeText);  // Create a file and write the content of writeText to it

string readText = File.ReadAllText("filename.txt");  // Read the contents of the file
Console.WriteLine(readText);  // Output the content

The output will be: