combobox in datagridview

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C#

here is my code for binding data in datagridview...........

if (con.State == ConnectionState.Closed)
            {
                con.Open();
            }

 string sqlqry = "SELECT ITEMCODE, BROKTYPE,BROKRATE,TRANRATE,TranType,uptostdt,MARTYPE,MARRATE,PARTYTYPE FROM PITBROK";

            SqlDataAdapter da = new SqlDataAdapter(sqlqry, con);
            DataSet ds1 = new DataSet();
            da.Fill(ds1, "PITBROK");

            //if (ds1.Tables[0].Rows.Count > 0)
            for (int i = 0; i < ds1.Tables[0].Rows.Count; i++)
            {
               
                dataGridView1.ColumnCount = 9;
                dataGridView1.Rows.Add();

                dataGridView1[0, i].Value = ds1.Tables[0].Rows[i][0].ToString();
               
                string b = ds1.Tables[0].Rows[i][1].ToString();

                if (b == "O")
                {

                    dataGridView1[1, i].Value = "Opening Sauda";
                }
                else if (b == "P")
                {

                    dataGridView1[1, i].Value = "Persentage Wise";
                }
                else if (b == "T")
                {

                    dataGridView1[1, i].Value = "Transation";
                }
                dataGridView1[2, i].Value = ds1.Tables[0].Rows[i][2].ToString();
                dataGridView1[3, i].Value = ds1.Tables[0].Rows[i][3].ToString();
                string l = ds1.Tables[0].Rows[i][4].ToString();


                if (l == "O")
                {

                    dataGridView1[4, i].Value = "Opening Sauda";
                }
                else if (l == "P")
                {

                    dataGridView1[4, i].Value = "Persentage Wise";
                }
                else if (l == "T")
                {

                    dataGridView1[4, i].Value = "Transation";
                }


                dataGridView1[5, i].Value = ds1.Tables[0].Rows[i][5].ToString();
                string m = ds1.Tables[0].Rows[i][6].ToString();
                if (m == "Q")
                {

                    dataGridView1[6, i].Value = "Qty Wise(perunit)";
                }
                else if (m == "V")
                {

                    dataGridView1[6, i].Value = "Value Wise(in%)";
                }
                else if (m == "I")
                {

                    dataGridView1[6, i].Value = "Import Rates";
                }
                else if (m == "C")
                {
                    dataGridView1[6, i].Value = "Client Wise Margine";
                }

                dataGridView1[7, i].Value = ds1.Tables[0].Rows[i][7].ToString();
                dataGridView1[8, i].Value = ds1.Tables[0].Rows[i][8].ToString();


            }

data shown in datagridview now i want to combo box in broktype at a time only in one cell as enter key is press (combo box contain item like item1 item b item c..and so on....)


what i have to do please help me ..........please please please please please please please please please please please please please please
my emailid lakhanp22@gmail.com