I have 2 VB.NET forms, on Form 1 I have 4 dropdown lists and a submit button. The values in the dropdown lists come from a database, what I would like to happen and have tried to do is that the user selects values from the dropdown lists and then clicks on the submit button, once clicked, I would like to query the database and the relevant results are inserted into a dropdown list on Form 2, which has the dropdown list and a couple of radio buttons and a text box. Any help is greatly appreciated, many thanks in advance.

Forms are global classes, and can be referenced as any class would be.
If you have a form frmX, with a drop-down list optZ, from any code in the application you can access that drop-down's methods and so on with frmX.optZ....

So you can use the drop-down's methods for adding new items within a loop in “Form 1” which reads the rows of the database.

My mistake sorry for not making my problem clear, what I have is a form, on it are 4 dropdown lists, so for example in DDL1 we select BMW, in DDL2 we select RED, in DDL3 we select R-Reg and in DDL4 we select 1-owner, when the user clicks on the submit button, I would like to query a database and return values that are true on a different form in a dropdown list as you may have more than one value returned. Hope that makes my problem easier to understand?