asp.net如何上载多个文件

asp.net怎么下载多个文件
我的一个网站项目里，有这么一个功能，当用户点击按钮，服务器会生成2个文本文件，然后需要将这2个文件下载到用户电脑上，这个需要怎么做？
我在网上只找到下载一个文件的，如何下载多个文件？
[最优解释]

/// <summary>
        /// 压缩方法
        /// </summary>
        /// <param name="patch">预压缩的路径</param>
        /// <param name="rarPatch">压缩后的路径</param>
        /// <param name="rarName">压缩文件名</param>
        public static void RARsave(string patch, string rarPatch, string rarName)
        {
            String the_rar;
            RegistryKey the_Reg;
            Object the_Obj;
            String the_Info;
            ProcessStartInfo the_StartInfo;
            Process the_Process;
            try
            {
                the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\\WinRAR.exe\\Shell\\Open\\Command");
                the_Obj = the_Reg.GetValue("");
                the_rar = the_Obj.ToString();
                the_Reg.Close();
                the_rar = the_rar.Substring(1, the_rar.Length - 7);
                Directory.CreateDirectory(patch);
                //命令参数

                //the_Info = " a " + rarName + " " + @"C:Test?70821.txt"; //文件压缩

                the_Info = " a " + rarName + " " + patch + " -r"; ;
                the_StartInfo = new ProcessStartInfo();
                the_StartInfo.FileName = the_rar;
                the_StartInfo.Arguments = the_Info;
                the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                //打包文件存放目录

                the_StartInfo.WorkingDirectory = rarPatch; 
 
                the_Process = new Process();
                the_Process.StartInfo = the_StartInfo;
                the_Process.Start();
                the_Process.WaitForExit();
                the_Process.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }