private void button_single_Click(object sender, EventArgs e)  //个人短信----支持发送单个号码的短信
        {
            label4.Text = "短信发送中...";
            string telephone = textBox4.Text.Trim();  //获取电话号码
            string message = textBox3.Text.Trim();  //获取短信内容
            type = 1;
            if (CPPDLL.Sms_Send(telephone, message) == 1) //发短信过程，成功返回1，不成功返回0
            {
                label4.Text = "发送成功";
                in_history( System.DateTime.Now.ToString(), type, message, "" , telephone);//调用函数
            }
            else
            { 
                label4.Text = "发送失败"; 
            }
        }

 private void in_history(string time ,int type, string text, string name, string number)//将发送记录插入数据表
        {
            string connString = MessageModem.Properties.Settings.Default.ConnString;
            SqlConnection sqlConnection = new SqlConnection(connString);
            sqlConnection.Open();

            string newsql = string.Format("update t_history set time = time, type = type, text = text, name = name, number = number");
            SqlCommand newcmd = new SqlCommand(newsql, sqlConnection);
            SqlDataAdapter newdata = new SqlDataAdapter();
            newdata.UpdateCommand = newcmd;
            newcmd.ExecuteNonQuery();
        }

string newsql = string.Format("update t_history set time = '{0}', type = '{1}', text = '{2}', name = '{3}', number = '{4}'",time,type,text,name,number);