Hi,

I need help in VB.net.
I have a folder say "d:\test".
sort the files based on the "Time Modified"
At regular intervals this program should run so that copy all the files in that folder to another folder say "c:\temp". And should write the last filename and its timestamp in a text file.
The next time when the program runs, It should copy only files which are after the last filename that is updated in the text file. Now I should note the lastfilename in the text file.

EXAMPLE:

d:\test
filename TimeModified
1.txt 30, 2004, 12:36:22 AM
2.txt 30, 2004, 12:30.22 AM
3.txt 30, 2004, 12:29.22 AM
4.txt 30, 2004, 12:29.22 AM

When the Program runs at 30,2004, 12:30.24 AM
the program should copy only the following files to "c:\test"
2.txt 30, 2004, 12:30.22 AM
3.txt 30, 2004, 12:29.22 AM
4.txt 30, 2004, 12:29.22 AM

and should write to a text file last file name "2.txt" and its Timestamp " 12:30.22 AM"

Now the 1.txt will come fall into the folder "d:\test" at 30, 2004, 12:36:22 AM

When the program runs again say at 30, 2004, 12.37.00 AM it should copy only
1.txt 30, 2004, 12:36:22 AM
and should write the lastfilename as 1.txt and its timestamp as 12:36:22 AM

PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP

I would do something like this:

' set up paths...
Dim destPath As String = "", sourcePath As String = ""
' get a reference to the directory...
Dim di As New DirectoryInfo(sourcePath)
' get all the files in the directory...
Dim fis() As FileInfo = di.GetFiles()
' array to hold all files that have already been copied, must be
' static so that it persists...
Static fisCopied() As FileInfo
' reference to an individual file...
Dim fi As FileInfo

' go through all files in the directory...
For Each fi In fis
    If fisCopied.LastIndexOf(fisCopied, fi) > 0 Then
        ' file has already been copied, so do nothing...
    Else
        ' file hasn't yet been copied, so copy...
        fi.CopyTo(destPath)
        ' add the file to the list of files that have
                ' been copied...
        ReDim Preserve fisCopied(fisCopied.GetUpperBound(0) _
                                                             + 1)
        fisCopied(fisCopied.GetUpperBound(0)) = fi
    End If
Next

Therefore, once a file has been copied, it won't be copied again. If you need to write out any further details of the file being copied, just interrogate the properties (I'm not sure if the fileinfo object is serialisable, but this would be the easiest way of saving it). Further to this, if the fileinfo object is serialisable, you could save the fisCopied object rather than having it as a static variable, if the calls to the sub are pretty infrequent and you don't want to hold fisCopied in memory for an extended period.