if (ID_试卷 > 0)
            {
                S_试卷试题 s_试卷试题 = new S_试卷试题();
                s_试卷试题.ID_试卷 = ID_试卷;
                s_试卷试题.S_试题类型 = 2;
                s_试卷试题.LoadData();
                s_试卷试题.ShowDialog();
                ID_试卷 = ID_试卷;
            }
            else
                MessageBox.Show("试卷未保存，请先报存试卷信息.");
        }
        private void btn名词解释_Click(object sender, EventArgs e)
        {
            if (ID_试卷 > 0)
            {
                S_试卷试题 s_试卷试题 = new S_试卷试题();
                s_试卷试题.ID_试卷 = ID_试卷;
                s_试卷试题.S_试题类型 = 3;
                s_试卷试题.LoadData();
                s_试卷试题.ShowDialog();
                ID_试卷 = ID_试卷;
            }
            else
                MessageBox.Show("试卷未保存，请先报存试卷信息.");
        }
        private void btn简答题_Click(object sender, EventArgs e)
        {
            if (ID_试卷 > 0)
            {
                S_试卷试题 s_试卷试题 = new S_试卷试题();
                s_试卷试题.ID_试卷 = ID_试卷;
                s_试卷试题.S_试题类型 = 4;
                s_试卷试题.LoadData();
                s_试卷试题.ShowDialog();
                ID_试卷 = ID_试卷;
            }
            else 《计算机网络》课程通用题库管理系统设计与实现(19):http://www.youerw.com/jisuanji/lunwen_183.html