基础-ADO插入数据后返回自增ID @@IDENTITY

在文件上传中，没上传一个文件都会插入一条数据信息，那么就要返回插入的数据的id，以便进行真实删除操作。
以下是ADO操作数据库的返回方法：

string sql = string.Format(@"insert into PaperAttachment (PaperID, FileTitle, FileName, ContentType, FileSize,admin_name, CookieID, PaperType,Subfolder,intime)
                                            values (0,'{0}','{0}','{1}',{2},'{3}','{4}',{5},'{6}','{7}')
                                                                                SELECT @@IDENTITY as Id"
                                                                                  , fileTitle
                                                                                  , extension
                                                                                  , filesize
                                                                                  , swfupuser
                                                                                  , cookieId
                                                                                  , paperType
                                                                                  , subfolder
                                                                                  , intime
                                                                                  );
                        //ado操作数据 链接对象
                        SqlConnection coreDB = new SqlConnection();
                        //链接字符串
                        coreDB.ConnectionString = ConfigurationManager.AppSettings["MYSqlConn"];
                        //执行SQL语句
                        SqlCommand myCommand = new SqlCommand(sql, coreDB);
                        coreDB.Open();
                        SqlDataReader myReader = myCommand.ExecuteReader();
                        string result = "";
                        while (myReader.Read())
                        {
                            result = myReader["id"].ToString();
                        }
                        myReader.Close();
                        coreDB.Close();