You can have them deleted on reboot. You'll need the P/Invoke declarations for MoveFileEx:
[Flags]
internal enum MoveFileFlags
{
None = 0,
ReplaceExisting = 1,
CopyAllowed = 2,
DelayUntilReboot = 4,
WriteThrough = 8,
CreateHardlink = 16,
FailIfNotTrackable = 32,
}
internal static class NativeMethods
{
[DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Unicode)]
public static extern bool MoveFileEx(
string lpExistingFileName,
string lpNewFileName,
MoveFileFlags dwFlags);
}
if (!NativeMethods.MoveFileEx("a.txt", null, MoveFileFlags.DelayUntilReboot))
{
Console.Error.WriteLine("Unable to schedule 'a.txt' for deletion");
}