C#

/// <summary>
/// GetVolumeInformation
/// </summary>
/// <param name="rootPathName"></param>
/// <param name="lpVolumeNameBuffer"></param>
/// <param name="nVolumeNameSize"></param>
/// <param name="lpVolumeSerialNumber"></param>
/// <param name="lpMaximumComponentLength"></param>
/// <param name="lpFileSystemFlags"></param>
/// <param name="lpFileSystemNameBuffer"></param>
/// <param name="nFileSystemNameSize"></param>
/// <returns></returns>
[DllImport("kernel32.dll")]
public static extern int GetVolumeInformation(	// BOOL
	string rootPathName,					// LPCTSTR root directory
	StringBuilder lpVolumeNameBuffer,		// LPTSTR volume name buffer
	int nVolumeNameSize,					// DWORD length of name buffer
	int lpVolumeSerialNumber,				// LPDWORD volume serial number
	int lpMaximumComponentLength,			// LPDWORD maximum file name length
	int lpFileSystemFlags,					// LPDWORD file system options
	StringBuilder lpFileSystemNameBuffer,	// LPTSTR file system name buffer
	int nFileSystemNameSize);				// DWORD length of file system name buffer

/// <summary>
/// GetDiskFreeSpaceEx.
/// </summary>
/// <param name="rootPathName"></param>
/// <param name="lpFreeBytesAvailable"></param>
/// <param name="lpTotalNumberOfBytes"></param>
/// <param name="lpTotalNumberOfFreeBytes"></param>
/// <returns></returns>
[DllImport("kernel32.dll")]
public static extern int GetDiskFreeSpaceEx(string rootPathName,
	ref long lpFreeBytesAvailable, ref long lpTotalNumberOfBytes, 
	ref long lpTotalNumberOfFreeBytes);

Richard Blythe wrote:

what about un-wiring event handlers from a class before it's reference is set to null? I've code that removes handlers and code that doesn't.