pinvoke.net: Edit: coredll.GetDiskFreeSpaceEx

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@pinvoke=http://pinvoke.net/$$$.htm

Summary: Retrieves information about the amount of space available on a disk volume.

!!!!C# Signature:
 [DllImport("coredll.dll", SetLastError=true, CharSet=CharSet.Auto)]
 [return: MarshalAs(UnmanagedType.Bool)]
   static extern bool GetDiskFreeSpaceEx(string lpDirectoryName, 
   out ulong lpFreeBytesAvailable, 
   out ulong lpTotalNumberOfBytes, 
   out ulong lpTotalNumberOfFreeBytes);
!!!!VB.Net Signature:
    <DllImport("coredll.dll", EntryPoint:="GetDiskFreeSpaceEx", SetLastError:=True, CharSet:=CharSet.Auto)> _
    Private Shared Function GetDiskFreeSpaceEx( _
        ByVal lpDirectoryName As String, _
        ByRef lpFreeBytesAvailable As ULong, _
        ByRef lpTotalNumberOfBytes As ULong, _
        ByRef lpTotalNumberOfFreeBytes As ULong) As Boolean
    End Function
or
   Private Declare Function GetDiskFreeSpaceEx _
   Lib "kernel32" _
   Alias "GetDiskFreeSpaceExA" _
  (ByVal lpDirectoryName As String, _
  ByRef lpFreeBytesAvailableToCaller As Long, _
  ByRef lpTotalNumberOfBytes As Long, _
  ByRef lpTotalNumberOfFreeBytes As Long) As Long
!!!!User-Defined Types:
None.

!!!!Notes:
None.

!!!!Tips & Tricks:
VB.NET does not require "\\" to specify "\", so for example in VB on a device
            iret = GetDiskFreeSpaceEx("\", Freebytes, TotalBytes, TotalFreebytes)

!!!!Sample Code:
 ulong FreeBytesAvailable;
 ulong TotalNumberOfBytes;
 ulong TotalNumberOfFreeBytes;

bool success = GetDiskFreeSpaceEx("C:\\", out FreeBytesAvailable, out TotalNumberOfBytes,
		                   out TotalNumberOfFreeBytes);
 if (!success)
    throw new System.ComponentModel.Win32Exception();
 
 Console.WriteLine("Free Bytes Available:      {0,15:D}", FreeBytesAvailable);
 Console.WriteLine("Total Number Of Bytes:     {0,15:D}", TotalNumberOfBytes);
 Console.WriteLine("Total Number Of FreeBytes: {0,15:D}", TotalNumberOfFreeBytes);

Documentation: GetDiskFreeSpaceEx@msdn on MSDN