Q:

Delete files older than 3 months old in a directory using .NET

I would like to know (using C#) how I can delete files in a certain directory older than 3 months, but I guess the date period could be flexible. 
Just to be clear: I am looking for files that are older than 90 days, in other words files created less than 90 days ago should be kept, all others deleted.

A:

Something like this outta do it.    
using System.IO; 

string[] files = Directory.GetFiles(dirName);

foreach (string file in files)
{
   FileInfo fi = new FileInfo(file);
   if (fi.LastAccessTime < DateTime.Now.AddMonths(-3))
      fi.Delete();
}

A:

Here's a 1-liner lambda:
Directory.GetFiles(dirName)
         .Select(f => new FileInfo(f))
         .Where(f => f.LastAccessTime < DateTime.Now.AddMonths(-3))
         .ToList()
         .ForEach(f => f.Delete());

A:

For those that like to over-use LINQ.
(from f in new DirectoryInfo("C:/Temp").GetFiles()
 where f.CreationTime < DateTime.Now.Subtract(TimeSpan.FromDays(90))
 select f
).ToList()
    .ForEach(f => f.Delete());

