retriving data in griedviewcmoboboxcolumn from sql table

hi can anyone help me for my windows application which containing 2 textbox,1 button i.e save_Button,1 griedview and my problem is that i want retriving data in griedviewcomboboxcolumn from sql table and after selection value from griedviewcomboboxcolumn it gives its equivalent value in griedviewtextboxcolumni.e selection of service_name from griedviewcomboboxcolumn it gives service_price in griedviewtextboxcolumn and saving all information in sql table after click on save button