Save the connection as a static object variable in the UDF and test if it is
nothing or not (set connection if so), or as a module level variable and do
likewise.

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HTH

Bob

"Simon" wrote in message
...
Hi,

I have an excel worksheet where a number of cells use a UDF to retrieve
data
from an access database, the UDF uses ADODB to communicate to the
database.
When the spreadsheet updates the formulas it takes quite a while to
calculate
the cells I think its because for each cell that contain the UDF, the UDF
creates a new connection to the database is there a more efficient way of
doing this maybe re-using the one connection?

Thanks.
Simon