How to copy only new files from folder A to B(AppendConstrainLine, FileInfo.Exists )

[alexandergre]

So I want to copy only *new/edited* files from source folder to the destination folder. I can do a normal copy from from folder A to B. I also can the overwrite method.. But im stuck at this one:

                DirectoryInfo dir = new DirectoryInfo(@"" + source);
                FileInfo[] filesource = dir.GetFiles("*.*");

                DirectoryInfo dir2 = new DirectoryInfo(@"" + destination);
                FileInfo[] filedest = dir.GetFiles("*.*");

               if (filesource[x].Exists && filesource[x].CreationTime )

if the file dose not exist in folder B then COPY
if the file does exist in folder B, but its creation time is older than the file in folder A, then COPY.

I found this: http://dotnetperls.com/Content/File-Copy-Backups.aspx but couldnt get it.
please help. thanx a lot guys!