protected void btnAddLost_Click(object sender, EventArgs e)
    {
        int    roleID       = Convert.ToInt32(ddlUserRole.SelectedItem.Value.Trim());
        string roleName     = ddlUserRole.SelectedItem.Text.Trim();
        string source       = this.FileUpload1.PostedFile.FileName;
        string getExtension = System.IO.Path.GetExtension(source);

        if (source == String.Empty || getExtension != ".xls")
        {
            this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('请选择Excel文件!');</script>");
            return;
        }
        else
        {
            if (roleName == "管理员")
            {
                int num = adminManage.AddAdmins(source, roleID);
                if (num > 0)
                {
                    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加成功!');</script>");
                }
                else
                {
                    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加失败!原因可能为:您添加的用户已存在');</script>");
                }
            }
            else if (roleName == "学生")
            {
                int num = studentManage.AddStudents(source, roleID);
                if (num > 0)
                {
                    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加成功!');</script>");
                }
                else
                {
                    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加失败!原因可能为:您添加的用户已存在');</script>");
                }
            }
            else if (roleName == "教师")
            {
                int num = teacherManage.AddTeachers(source, roleID);
                if (num > 0)
                {
                    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加成功!');</script>");
                }
                else
                {
                    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加失败!原因可能为:您添加的用户已存在');</script>");
                }
            }
        }
    }