Check last modified date of file in C#

Question

I\'m looking to find out a way of seeing when a file was last modified in C#. I have full access to the file.

Answer 1

You simply want the File.GetLastWriteTime static method.

Example:

var lastModified = System.IO.File.GetLastWriteTime("C:\foo.bar");

Console.WriteLine(lastModified.ToString("dd/MM/yy HH:mm:ss"));

Note however that in the rare case the last-modified time is not updated by the system when writing to the file (this can happen intentionally as an optimisation for high-frequency writing, e.g. logging, or as a bug), then this approach will fail, and you will instead need to subscribe to file write notifications from the system, constantly listening.