谁能帮我注释一下每句代码的意思

 class DataBaseOperate
    {      
        SqlConnection  conn;

        private void OpenConn()//打开数据库
        {
            conn = new SqlConnection();

conn.ConnectionString = ConfigurationManager.AppSettings["sqlconn"].ToString();  
            conn.Open();
        }

        private void CloseConn()//关闭数据库
        {
            conn.Close();
            conn.Dispose();
        }

        public DataSet GetDataSet(string Sql)//根据sql语句获得一个DataSet
        {
            OpenConn();
            SqlDataAdapter da = new SqlDataAdapter(Sql, conn);
            DataSet ds = new DataSet();
            da.Fill(ds);
            return ds;
            CloseConn();
        }

        public DataTable ExecQuery(string Sql)//根据sql语句获得一个DataTable
        {
            OpenConn();
            SqlDataAdapter da = new SqlDataAdapter(Sql, conn);
            DataTable dt = new DataTable();
            da.Fill(dt);
            return dt;
            CloseConn();
        }

        public string GetSingleValueFromSql(string strSql)//根据sql语句获得一个单值字符串
        {
            OpenConn();
            try
            {
                SqlCommand cmd = new SqlCommand(strSql, conn);
                string result = cmd.ExecuteScalar().ToString();
                return result;
            }
            catch
            {
                return "";
            }
            CloseConn();
        }

        public bool ExecNoQuery(string strSql)//根据sql语句执行非查询操作
        {
            OpenConn();
            try
            {
                SqlCommand cmd = conn.CreateCommand();
                cmd.CommandText = strSql;
                cmd.ExecuteNonQuery();
                return true;
            }
            catch
            {
                return false;
            }
            CloseConn();
        }       
        //执行事务处理SQL
        public bool ExecTSQL(string[] strSql)         {
            OpenConn();
            SqlTransaction trans = conn.BeginTransaction(IsolationLevel.ReadCommitted);
            try
            {
                for (int i = 0; i < strSql.Length; i++)
                {
                    if (strSql[i] == "" || strSql[i] == null) { continue; }
                    SqlCommand sqlCmd = conn.CreateCommand();
                    sqlCmd.Transaction = trans;
                    sqlCmd.CommandText = strSql[i];
                    sqlCmd.ExecuteNonQuery();
                }
                trans.Commit();
                return true;
            }
            catch
            {
                trans.Rollback();
                return false;
            }
            finally
            {
                trans = null;
                CloseConn();
            }
        }

        //执行存储过程
        public bool ExecProc(string strProcName)
        {
            OpenConn();
            try
            {
                SqlCommand sqlCmd = conn.CreateCommand();
                sqlCmd.CommandType = CommandType.StoredProcedure;
                sqlCmd.CommandText = strProcName;

                sqlCmd.ExecuteNonQuery();
                return true;
            }
            catch
            {
                return false;
            }
            finally
            {
                CloseConn();
            }
        }

        //执行带参存储过程
        public void ExecProc(string strProcName, SqlParameter[] parameters)
        {
            OpenConn();
            try
            {
                SqlCommand sqlCmd = conn.CreateCommand();
                sqlCmd.CommandText = strProcName; //声明存储过程名
                sqlCmd.CommandType = CommandType.StoredProcedure;
                foreach (SqlParameter parameter in parameters)
                {
                    sqlCmd.Parameters.Add(parameter);
                }

                sqlCmd.ExecuteNonQuery();
            }
            finally
            {
                CloseConn();
            }
        }
    }