lire et tester le contenu d'un windows form textbox

Code:
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DriveInfo[] allDrives = DriveInfo.GetDrives();
foreach (DriveInfo d in allDrives)
{
  Console.WriteLine("Drive {0}", d.Name);
  Console.WriteLine(" File type: {0}", d.DriveType); 
  if (d.IsReady == true)
  {
    Console.WriteLine(" Volume label: {0}", d.VolumeLabel);
    Console.WriteLine(" File system: {0}", d.DriveFormat);
    Console.WriteLine(" Available space to current user:{0, 15} bytes", d.AvailableFreeSpace);
    Console.WriteLine(" Total available space: {0, 15} bytes", d.TotalFreeSpace);
    Console.WriteLine(" Total size of drive: {0, 15} bytes ", d.TotalSize);
  }
}