private void btn_save_Click(object sender, EventArgs e)
        {
            //初始化数据
            DialogResult result = MessageBox.Show("确定保存信息?", "操作提示",
                                                  MessageBoxButtons.OKCancel, MessageBoxIcon.Information);

            if (result == DialogResult.Cancel)
            {
                return;
            }
            if (result == DialogResult.OK)
            {
                //确定没有空输入
                if (txt_parent_num.Text == "")
                {
                    MessageBox.Show("请输入家长编号!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_print_num.Text == "")
                {
                    MessageBox.Show("请输入打印编号!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (cbo_reception.SelectedItem == null)
                {
                    MessageBox.Show("请选择接待人!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_parent_name.Text == "")
                {
                    MessageBox.Show("请输入家长称呼!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_phone.Text == "")
                {
                    MessageBox.Show("请输入联系方式!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_phone.TextLength > 11)
                {
                    MessageBox.Show("联系方式不得超过11位!请重新输入!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    txt_phone.Text = "";
                    return;
                }
                if (txt_sadd.Text == "")
                {
                    MessageBox.Show("请输入家教地址(简单)!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_dadd.Text == "")
                {
                    MessageBox.Show("请输入家教地址(详细)!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_grade_stu.Text == "")
                {
                    MessageBox.Show("请输入年级!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_subject_stu.Text == "")
                {
                    MessageBox.Show("请输入科目!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (!rdo_man.Checked && !rdo_woman.Checked)
                {
                    MessageBox.Show("请选择学员性别!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_tutor_price.Text == "")
                {
                    MessageBox.Show("请输入家教价格!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (txt_tutor_time.Text == "")
                {
                    MessageBox.Show("请输入家教时间!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }
                if (cbo_payment_state.SelectedItem == null)
                {
                    MessageBox.Show("请选择缴费状态!", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }


                objectclass.tutoringinfo tutor1 = new objectclass.tutoringinfo();
                //为字段赋值

                tutor1.parent_num     = txt_parent_num.Text.Trim();
                tutor1.print_num      = txt_print_num.Text.Trim();
                tutor1.reception      = cbo_reception.SelectedItem.ToString();
                tutor1.reception_time = dt_recepiton_time.Value.ToString();
                tutor1.parent_name    = txt_parent_name.Text.Trim();
                tutor1.phone          = txt_phone.Text.Trim();
                tutor1.simple_adr     = txt_sadd.Text.Trim();
                tutor1.detail_adr     = txt_dadd.Text.Trim();
                tutor1.grade_stu      = txt_grade_stu.Text.Trim();
                tutor1.subject_stu    = txt_subject_stu.Text.Trim();
                if (rdo_man.Checked)
                {
                    tutor1.student_sex = rdo_man.Text;
                }
                else
                {
                    tutor1.student_sex = rdo_woman.Text;
                }
                tutor1.tutors_price   = txt_tutor_price.Text.Trim();
                tutor1.tutors_time    = txt_tutor_time.Text.Trim();
                tutor1.sex            = cbo_sex.SelectedItem.ToString();
                tutor1.place          = txt_place.Text.Trim();
                tutor1.grade          = txt_grade.Text.Trim();
                tutor1.subject        = txt_subject.Text.Trim();
                tutor1.other_requests = txt_other_requests.Text.Trim();
                tutor1.payment_state  = cbo_payment_state.SelectedItem.ToString();
                tutor1.payment_time   = dt_payment_time.Value.ToString();

                //数据库操作
                //...
            }
        }
 public tutoring_info(objectclass.tutoringinfo tutor1)
 {
     InitializeComponent();
     tutor = tutor1;
 }