protected void btConfirm_Click(object sender, EventArgs e)
    {
        Admin admin = new Admin();
        Search thisSearch = new Search();
        StudentInfo thisStudent = new StudentInfo();

        // 从界面读取学生信息
        thisStudent.StrStudentNO = tbxStuNO.Text;// 读取学号
        thisStudent.StrStudentName = tbxStuName.Text;// 姓名
        thisStudent.StrIdentityId = tbxIdentityNO.Text;// 身份证号
        MD5CryptoServiceProvider HashMD5 = new MD5CryptoServiceProvider();// 设置初始密码
        thisStudent.StrPassword = ASCIIEncoding.ASCII.GetString(HashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes("888888")));

        string stuNO=this.tbxStuNO.Text;// 获取学号

        if (Convert.ToInt32(this.DropDownList1.SelectedValue) == 0)
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert",
                "<script>alert('请选择班级!')</script>");
            return;
        }
        ////else if (thisStudent.StrIdentityId == thisSearch.GetStudentByUsername(stuNO).StrIdentityId)
        // 武剑洁修改,2009-9-11
        else if (thisSearch.GetStudentIdByUsername(tbxStuNO.Text) > 0)
        {// 用户名重复,则禁止添加新用户
            Response.Write("<script>alert('用户名重复,该同学已存在!')</script>");
            tbxStuNO.Text = "";// 清空输入
            return;
        }
        else if (thisSearch.GetStudentIdByIdentityID(tbxIdentityNO.Text) > 0)
        {// 身份证号重复,则禁止添加新用户
            Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert","<script>alert('身份证号重复,该同学已经存在!')</script>");
            tbxIdentityNO.Text = "";// 清空输入
            return;
        }

        thisStudent.StrStudentNO=this.tbxStuNO.Text;
        thisStudent.StrStudentName=this.tbxStuName.Text;
        thisStudent.StrIdentityId=this.tbxIdentityNO.Text;
        thisStudent.ClassName = this.DropDownList1.SelectedItem.Text;
        HashMD5 = new MD5CryptoServiceProvider();
        thisStudent.StrPassword = ASCIIEncoding.ASCII.GetString(HashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes("888888")));

         if (admin.AddStudent(thisStudent))
        {
            //Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert",
            //    "<script>alert('添加成功!')</script>");
            // 武剑洁修改,添加页面跳转,2009-9-10
            Response.Write("<script>alert('添加成功!');window.location='./Student_Manage.aspx'</script>");
        }
        else
        {
            //Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert",
            //    "<script>alert('添加失败!')</script>");
            // 武剑洁修改,添加页面跳转,2009-9-10
            Response.Write("<script>alert('添加成功!');window.location='./Student_Manage.aspx'</script>");
        }
    }