textBox1.Text = dt.Rows[0]["Z_账号"].ToString();
                textBox1.ReadOnly = true;
                textBox2.Text = dt.Rows[0]["M_密码"].ToString();
                textBox3.Text = dt.Rows[0]["密码重置问题"].ToString();
                textBox4.Text = dt.Rows[0]["密码重置答案"].ToString();
            }}
        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                MessageBox.Show("账号不能为空");
            }
            else if (textBox2.Text == "")
            {
                MessageBox.Show("密码不能为空");
            }
            else if (textBox3.Text == "")
            {
                MessageBox.Show("密码重置问题不能为空");
            }
            else if (textBox4.Text == "")
            {
                MessageBox.Show("密码重置答案不能为空");
            }
            else
            {
                if (ID_用户 > 0)
                {
                    BL_数据管理.Update_个人信息(ID_用户 ,textBox2.Text, textBox3.Text, textBox4.Text);
                    MessageBox.Show("修改成功");
                }
                else
                {
                    if (BL_数据管理.Get_密码重置问题(textBox1.Text).Rows.Count == 0) 《计算机网络》课程通用题库管理系统设计与实现(12):http://www.youerw.com/jisuanji/lunwen_183.html