System IO C# by API

using System;
using System.IO;
class MainClass {
    static void Main(string[] args) {
        FileInfo file = new FileInfo("c:\\a.txt");
        // Display drive information.
        DriveInfo drv = new DriveInfo(file.FullName);
        Console.Write("Drive: ");
        Console.WriteLine(drv.Name);
        if (drv.IsReady) {
            Console.Write("Drive free space: ");
            Console.WriteLine(drv.AvailableFreeSpace.ToString());
        }
    }
}