Transfer items from datagridview on one form to a combobox on a different form

Hello,

I'm pretty new to C# so please bear with me.

I would like to transfer data from a cell in a datagridview on one form, to a combobox on another form.

I can do it with no problem using text boxes, just having trouble with this!

Basically when a user double-clicks any cell on the datagridview it opens up a new form with all the data in different textboxes, the only object that doesn't populate is the combobox.

Any help would be greatly appreciated, if you need more info let me know.

Thanks in advance,

Brendan