//绑定搜索到的学生数据到DataList
    protected void DataListBind()
    {
        tableHeader = this.GetTableHeader();
        DalOperationAboutGradeCheck dos = new DalOperationAboutGradeCheck();
        DataView dv = dos.SearchStudentsList(ddlSearchYear.SelectedValue, ddlSearchMajor.SelectedValue, ddlSearchSchoolClass.SelectedValue, txtKeyword.Text.Trim(),ddlGradeCheckLocale.SelectedValue,ddlGradeCheckDegree.SelectedValue).Tables[0].DefaultView;

        this.AspNetPager2.RecordCount = dv.Count;
        PagedDataSource pds = new PagedDataSource();    //定义一个PagedDataSource类来执行分页功
        pds.DataSource = dv;
        pds.AllowPaging = true;
        pds.CurrentPageIndex = pageIndex - 1;
        pds.PageSize = CommonUtility.pageSize;

        this.dlSearchStudent.DataSource = pds;
        this.dlSearchStudent.DataBind();

        if (pds.Count == 0)
        {
            this.dlSearchStudent.ShowFooter = true;
        }
        else
        {
            this.dlSearchStudent.ShowFooter = false;
        }
    }