Get Directory Size using C#

static long GetDirectorySize(string path)

{

    long folderSize = 0;

    string[] files = Directory.GetFiles(path, "*.*", System.IO.SearchOption.AllDirectories);            

    foreach (string file in files)

    {              

        FileInfo info = new FileInfo(file);

        folderSize += info.Length;

    }

    return folderSize;

}

MessageBox.Show("Folder Size: " + GetDirectorySize("D:\\Fonts"));