/// <summary>
        /// 添加学生;
        /// </summary>
        private void AddStudent()
        {
            frm_StudentInfo studentInfoForm = new frm_StudentInfo(null, this.ClassNo);

            studentInfoForm.ShowDialog();
            this.LoadCurrentClassStudents();
        }
        /// <summary>
        /// 编辑学生;
        /// </summary>
        private void EditStudent()
        {
            string currentStudentNo =
                this.dgv_Student.CurrentRow.Cells[0].Value.ToString();
            frm_StudentInfo studentInfoForm = new frm_StudentInfo(currentStudentNo, 0);

            studentInfoForm.ShowDialog();
            this.LoadCurrentClassStudents();
        }