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Note This method may return an inaccurate value, because it uses native functions whose values may not be continuously updated by the operating system.
The value of the FileSystemInfo.LastWriteTime property is pre-cached if the current instance of the System.IO.FileSystemInfo object was returned from any of the following System.IO.DirectoryInfo methods:
To get the latest value, call the FileSystemInfo.Refresh method.
If the file described in the System.IO.FileSystemInfo object does not exist, this property will return 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC), adjusted to local time.
This property value is null if the file system containing the file does not support this information.