因为我还是新的C#和编程可能有人请帮助我我没有得到消息后
SerialPort sp = new SerialPort("COM9", 115200, Parity.None, 8, StopBits.One);
if (sp.IsOpen)
sp.Close();
if (!sp.IsOpen)
sp.Open();
sp.WriteLine("AT+CMGF=1" + Environment.NewLine);
Console.WriteLine("AT+CMGF=1" + Environment.NewLine);
sp.ReadLine();
sp.WriteLine("AT+CMGS=" + (char)34 + textBox1.Text + (char)34 + Environment.NewLine);
Console.WriteLine("AT+CMGS=" + (char)34 + textBox1.Text + (char)34 + Environment.NewLine);
sp.WriteLine((char)34+textBox2.Text+(char)34 + Environment.NewLine );
Console.WriteLine((char)34 + textBox2.Text + (char)34 + Environment.NewLine);
sp.Close();