Dim rng1 as Range, rng2 as Range, rng3 as Range
set rng1 = Range(Range("A1"),Range("A1").End(xldown))
set rng2 = Range(Range("B1"),Range("B1").End(xldown))
set rng3 = Range("IV1")
rng1.copy rng3
rng2.copy rng3.End(xldown)(2)
range(rng3,rng3.End(xldown)).Name = "List"

use List as the soure for your data validation.
Use the change event to update the data in IV2 (run the macro) whenever the
user makes a change in column A or B (adapt to your actual locations).

--
Regards,
Tom Ogilvy



"OTS" wrote:

Is there a way to do that when the two columns change their size. The two
lists will not be static, since they change when the user adds data.

"Tom Ogilvy" wrote:

create a fourth location that has all the data and point your validation list
at this location.

--
Regards,
Tom Ogilvy


"OTS" wrote:

Hi.
I've got two columns containing data. A third coulmn can only contain data
from those two. What I need to do is, when adding validation to the third
column, add the data registerd in column 1 to the data in column 2 so that I
get a list to choose from in the dropdownlist in column 3.
Anyone got any idea on how to solve this?