working with datagridcombo box

DataGridViewComboBoxColumn Actioncolumn = new DataGridViewComboBoxColumn();
            Actioncolumn.DataPropertyName = "ZSL_Action";
            Actioncolumn.HeaderText = "Action";
            string[] installs = new string[] { "red", "white", "green" };
            Actioncolumn.Items.AddRange(installs);
            //Actioncolumn.Items.Add("red");
            //Actioncolumn.Items.Add("white");
            //Actioncolumn.Items.Add("green");
            Actioncolumn.ReadOnly = false;
            dataGridView1.Columns.Add(Actioncolumn);