关于C#里面SQLite读取数据的操作

//挂载表格时候用        
public static DataSet Query(string SQLString)
        {
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
                catch (System.Data.SQLite.SQLiteException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;　　　　//返回的是一个DataSet
            }
        }

Grd.DataSource=Query(SQL).Tables[0]

        /// 执行查询语句，返回SQLiteDataReader//获取返回值用
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SQLiteDataReader</returns>
        public static SQLiteDataReader ExecuteReader(string strSQL)
        {
            SQLiteConnection connection = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
            try
            {
                connection.Open();
                SQLiteDataReader myReader = cmd.ExecuteReader();
                return myReader;
            }
            catch (System.Data.SQLite.SQLiteException e)
            {
                throw new Exception(e.Message);
            }

        }

            SQLiteDataReader SqlDr = DbSQLite.ExecuteReader(sql);　　　　//SQLiteDataReader需要先引用,using System.Data.SQLite;
            try { 
                while(SqlDr.Read()){
                    int rn = SqlDr.GetInt32(1);
                    string rname=SqlDr.GetValue(0).ToString();　　//字段读取方式
                    if (rn == 5)
                    {
                        //if (rname.Equals("1"))
                        //{
                        //    str += SqlDr.GetValue(2).ToString() + "是" + "\r\n";
                        //}
                        //else {
                        //    str += SqlDr.GetValue(2).ToString() + "否" + "\r\n";
                        //}
                        
                    }
            }catch
            {        
            }