Question

I have a list box that reads from a textfile to which the user can add and remove file extension types, this compiling a list of files to be excluded from deletion.

how can I program vb.net to delete all files of a given directory example C:\MYFILES except if found in my list?

Answer 1

This will delete all files in a given directory which extension is not in the exclude-list:

Dim exclude = ListBox1.Items.Cast(Of Object).Select(Function(i) i.ToString)
Dim delQ = From path In IO.Directory.GetFiles("C:\MYFILES")
           Where Not exclude.Contains(IO.Path.GetExtension(path))
           Select New IO.FileInfo(path)
For Each delFile In delQ
    delFile.Delete()
Next

_{Don’t forgot the point in the file-extension(f.e. .txt)}