>I think I'm close, I need to do a check before continue on to next step, if I use a Do while I get into a loop I can't get out of and if I use IF it continues on.
>
>I have a start date that needs to greater than the end date so here are the ways of written:
> Thanks
>

>if startdate > enddate then
> messagebox("whatever...)
>endif
>
>do while startdate > enddate
> messagebox("whatever...)
> loop
> exit
>enddo
>

LOOP or EXIT will go to the beginning, or after the end, of a DO WHILE, but not of an IF. You can have IF within DO WHILE:

do while (some condition)
  aaa
  bbb
  ccc
  if (some other condition)
    exit && or loop
  endif
  ddd
  eee
  fff
enddo

Here, EXIT will go after the ENDDO, and DO WHILE will go back to the DO WHILE immediately.

In some cases, when you have more complicated logic (for example, nested DO WHILEs), you may need to set flags (logical variables), which you check later.