把access数据库导入excel表格

    public void ExportExcel(DataTable dtData, string filename)
    {
        System.Web.UI.WebControls.DataGrid dgExport = null;
        // 当前对话
        System.Web.HttpContext curContext = System.Web.HttpContext.Current;
        // IO用于导出并返回excel文件
        System.IO.StringWriter strWriter = null;
        System.Web.UI.HtmlTextWriter htmlWriter = null;
        if (dtData != null)
        {
            // 设置编码和附件格式

            curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename) + ".xls");//加HttpUtility.UrlEncode()方法处理文件名乱码

            curContext.Response.Charset = "gb2312";
            curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
            //HttpContext.Current.Response.ContentType=".xls/.txt/.doc";image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword
            curContext.Response.ContentType = ".xls";
            // 导出excel文件
            strWriter = new System.IO.StringWriter();
            htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);

            // 为了解决dgData中可能进行了分页的情况，需要重新定义一个无分页的DataGrid
            dgExport = new System.Web.UI.WebControls.DataGrid();
            dgExport.DataSource = dtData.DefaultView;
            dgExport.AllowPaging = false;
            dgExport.DataBind();

            // 返回客户端
            dgExport.RenderControl(htmlWriter);
            curContext.Response.Write(strWriter.ToString());
            curContext.Response.End();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        string paths = Server.MapPath("db1.mdb");
        string path = this.paths(paths);

        string sql = "select userNum as 编号 ,userName as 姓名,accountPlace as 开户行所在地,bankName as 开户行详细信息,cardID as 账号, mobilTelephone as 电话号码, demo as 备注 from member where   loginTime between format$( dateadd (/"d/",-Weekday(now()),DateValue(now())),/"yyyy-MM-dd/") and format$( dateadd(/"d/",-Weekday(now())+6,DateValue(now())),/"yyyy-MM-dd/")  and thread=1 and state='1'";
 
        SQLDAL.DBhelper db = new SQLDAL.DBhelper(path);

        DataTable da = db.getTable(sql, path);
        for (int i = 0; i < da.Rows.Count; i++)
        {
            da.Rows[i]["账号"] = da.Rows[i]["账号"].ToString() + "'";
        }

        ExportExcel(da, "aaa");
    }