>I have a form with two combo boxes. The output from the first (i.e. the controlsource - say Thisform.var1) is to be used to determine the data displayed in the second combobox by means of a filter based on var1 in an SQL statement in the RowSource. What is the best way to pass the controlsource to the SQL statement? Thisform.var1 is not allowed in the SQL statement in the rowsource. I have got round it by using a private variable in the form but I feel this is not the correct way to do it.

You can

bindevent(thisform, "var1", combo2, "requery")

and in the requery you can use aEvents() function to determine who called it, or you can go directly for luVar1=thisform.var1 and then use luVar1 in your SQL statement. You may bind the combo to the cursor instead of the statement, as you'd be running the statement programmatically (and I'm not sure if the variable would be visible in the SQL if you just set it in .requery() and then did a dodefault()).