DataGridView and Search Query

Question

I am making an windows application form for a resturant managment system which is connected with the access database(OLEDB) and i want to apply a query that is the selected value/name of the products in the combobox will show the result of  the selected product in the datagridview box. I searched a lot from internet but cant get the proper code for this. Thanx in advance if anyone can help me.