如何在 C# 中使用 USB 调制解调器发送批量短信

我已经成功编码为一次向一个手机号码发送短信，但我想批量发送。

我正在使用文本框来输入数字，

我想在文本框中输入几个数字并发送到该文本框中的所有数字。

这是表单代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using GsmComm.PduConverter;
using GsmComm.PduConverter.SmartMessaging;
using GsmComm.GsmCommunication;
using GsmComm.Interfaces;
using GsmComm.Server;
using System.Globalization;
using System.Text.RegularExpressions;
using MySql.Data.MySqlClient;
namespace yahapalana_DB
{
    public partial class sms : Form
    {
        public sms()
        {
            InitializeComponent();
        }
        private GsmCommMain comm;
        private delegate void SetTextCallback(string text);
        private SmsServer smsServer;
        TextBox txtmsg = new TextBox();
        TextBox txtno = new TextBox();

        private void button3_Click(object sender, EventArgs e)
        {
            if (comboBox1.Text == "")
            {
                MessageBox.Show("Invalied Port Name");
                return;
            }
            comm = new GsmCommMain(comboBox1.Text, 9600, 150);
            Cursor.Current = Cursors.Default;
            bool retry;
            do
            {
                retry = false;
                try
                {
                    Cursor.Current = Cursors.WaitCursor;
                    comm.Open();
                    Cursor.Current = Cursors.Default;
                    MessageBox.Show("Connect Successfully");
                }
                catch (Exception)
                {
                    Cursor.Current = Cursors.Default;
                    if (MessageBox.Show(this, "Modem not available", "Check", MessageBoxButtons.RetryCancel, MessageBoxIcon.Warning) == DialogResult.Retry) retry = true;
                    { return; }
                }
            } while (retry);
        }
        private void sms_Load(object sender, EventArgs e)
        {
            comboBox1.Items.Add("Com1");
            comboBox1.Items.Add("Com2");
            comboBox1.Items.Add("Com3");
            comboBox1.Items.Add("Com4");
        }
        private void button1_Click(object sender, EventArgs e)
        {
            try {
                string[] slist = text.Split(':');
                SmsSubmitPdu pdu;
                byte dcs = (byte)DataCodingScheme.GeneralCoding.Alpha7BitDefault;
                pdu = new SmsSubmitPdu(textmsg.Text,mobno.Text,dcs);
                int times = 1;
                for (int i=0;i<times;i++) {
                    comm.SendMessage(pdu);
                }
                MessageBox.Show("Message sent sucessfully");
            } catch (Exception ex) {
                MessageBox.Show("Modem not avaliable");
            }  
        }
        private void button2_Click(object sender, EventArgs e)
        {
            add_number au = new add_number();
            au.ShowDialog();
        }
    }
}

    private void button1_Click(object sender, EventArgs e)
    {
        try {
            string[] slist = text.Split(':');
            foreach (string mobno in slist) {
                SmsSubmitPdu pdu;
                byte dcs = (byte)DataCodingScheme.GeneralCoding.Alpha7BitDefault;
                pdu = new SmsSubmitPdu(textmsg.Text,mobno,dcs);
                int times = 1;
                comm.SendMessage(pdu);
            }
            MessageBox.Show("Message sent sucessfully");
        } catch (Exception ex) {
            MessageBox.Show("Modem not avaliable");
        }
    }