The one thing you haven't covered is what happens after "FFFFFFF". Do you start over? How fast will you get there? Will you archive the first batches so you won't have key problems?

>Yea you hit it on the nose, most (99.99%) users will have small needs 26 to 676 records, with "just in time" inventory the idea is to carry a minimal amount of stock, so it will be a minimal amount of records added
>
>Does that make sense?
>
>>Stephen,
>>
>>So most of the time the user will really only want to look at a "reasonable" number of lines, but just in case you want to be able to handle all of them? I think a grid can handle any number.
>>
>>
>>>No I am doing letter series for pre-numbered stock items, like AAA-001 thru ZZZ-999
>>>
>>>so when issuing my program can automatically jump to the correct next letter series
>>>i.e.
>>>in stock starting number AAA-990
>>>we issue 100
>>>I want to automatically, with no users intervention say 2 lines of issuing
>>>1st 10 each, AAA-990 thru AAA-999
>>>2nd 90 each, AAB-001 thru AAB-90
>>>
>>>and the procedure I am working on is just to set-up the letter series in advance
>>>there is no combobox, I want a grid or listbox to preview the results of building the letter series
>>>i.e. user enters starting letter: "AAA"
>>>user enters ending letter: "AAD"
>>>the preview will have
>>>AAA 1-999
>>>AAB 1-999
>>>AAC 1-999
>>>AAD 1-999
>>>
>>>does this make it clearer?
>>>
>>>>>Hello
>>>>>
>>>>>Not trying to be rude, but I don't need a example, because I also have a "ignored letters" i.e. "B,C" box and "ignored sets of letters" i.e. "FAG", "PMS"
>>>>>
>>>>>I have all the code in thought, but I am worrying about the number / lenght of the processes, running out of memory ya know stuff like that
>>>>>
>>>>>Thanks for the reply
>>>>
>>>>Stephen,
>>>>
>>>>There's some holes in your description. The users will enter something like cStart = "ABCDEFG", cEnd = "ABDFZZ" and you want to generate all the values in between and come up with what? Are you generating Keys for records (like lottery tickets) and the user will then enter one to access the rest of the record?
>>>>
>>>>What is the purpose of the combo box with all possible combinations?