如何设置和获取datagridview中checkbox的选中项

//DG_List为datagridview控件for (int i = 0; i < DG_List.RowCount; i++){if (DG_List.Rows[i].Cells [0].EditedFormattedValue.ToString() == "True")
//这里判断复选框是否选中{count++;}}if (count == 0){MessageBox.Show("请至少选择一条数据！", "提示");return;}else{if (MessageBox.Show(this, "您要更新数据么？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information).ToString() == "Yes"){for (int i = 0; i < count; i++){ps.Pexcute(" update cf_prj_certi set FIsPrint='"+number+"' where fid='" + DG_List.Rows[i].Cells["fnn"].Value.ToString() + "'"); //执行SQL}} else{return;}}} catch (Exception ex){MessageBox.Show(ex.ToString());
} this.ShowInfo(); //重新绑定datagridview}