I will be able to recover data from the operating system from the website? [closed]

// Create the file.
    using (FileStream fs = File.Create(filePath))
    {
        Byte[] info = new UTF8Encoding(true).GetBytes("This is some text in the file.");
        // Add some information to the file.
        fs.Write(info, 0, info.Length);
    }

Eeu gostaria de saber como pegar algo do sistema apartir de um website