C#

 <br />
<br />
string appDataPath = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData);<br />
string _localUserDataPath = Path.Combine(appDataPath,"My Company\\MyApp\\");<br />
<br />
if (!Directory.Exists(_localUserDataPath))<br />
     {<br />
          DirectorySecurity ds = new DirectorySecurity();<br />
          ds.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, AccessControlType.Allow));<br />
          Directory.CreateDirectory(_localUserDataPath, ds);<br />
     }<br />
else<br />
    {<br />
       // the directory exists - lets change security on it<br />
       DirectoryInfo di = new DirectoryInfo(_localUserDataPath);<br />
       DirectorySecurity ds = new System.Security.AccessControl.DirectorySecurity();<br />
       ds.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, AccessControlType.Allow));<br />
       di.SetAccessControl(ds);<br />
<br />
    }

awaldro wrote:

I'm working with scanned images. My users believe (incorrectly) that to get a good scan they need to work at 1000 dpi. Scanning an entire page yields a 250 MB image.

/// <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);