WEB 文件下载求教 如何不保存文件到服务器 直接实现读取流下载到浏览器客户端

Question

            System.Data.OleDb.OleDbDataReader dr = null;
            System.Data.OleDb.OleDbCommand cmd = new System.Data.OleDb.OleDbCommand();
            byte[] FileData=null;
            string type="";
            cmd.CommandText = "select * from FL_FILES where FL_ID=3";
            cmd.Parameters.Add(new System.Data.OleDb.OleDbParameter("@FL_ID", System.Data.OleDb.OleDbType.Integer)).Value = TextBox1.Text.Trim();
            cmd.Connection = conn;
            conn.Open();
            dr = cmd.ExecuteReader();
            if (dr.Read())
            {
                FileData = (byte[])dr["FL_DATA"];
                type=dr["FL_IMETYPE"].ToString();
            }
            dr.Close();
            conn.Close();
//string fileName="d:\\aaa"+type;
            System.IO.FileStream fs = new System.IO.FileStream("d:\\IIS[3]\\CMS\\DOWNLOADS\\aaa"+type, System.IO.FileMode.Create);
            System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs);
            bw.Write(FileData, 0, FileData.Length);
            bw.Close();如何不保存文件到服务器 直接实现读取流下载到浏览器客户端