Ajax实现的明细去除重复 datatable去除重复

ajax  Detail.aspx页面
 protected void Page_Load(object sender, EventArgs e)
    {
        Thread.Sleep(500);
        string Keyid = Request.QueryString["Id"].ToString();
        //string wsn = Request.QueryString["wsn"].ToString();
                                                
        DataTable dt = Hst.Paging.Paging.GetList(" ExecSN ='" + Keyid + "'  and (Status='已检验' or status='部分入库')", "V_ExecPro_Bom1").Tables[0];
        StringBuilder sb = new StringBuilder();
        sb.Append("<table style='width:83%' style='margin:2px;border:Double 3px #5D7B9D;'><tr><th>选择</th>");
        sb.Append("<th>产品编码</th><th>产品名称</th><th>产品规格</th><th>产品型号</th><th>产品材质</th>");
        sb.Append("<th>产品图纸号</th><th>产品单位</th><th>计划数量</th><th>合格数量</th><th>未入库数量</th><th>本次入库数量</th></tr>");
        string a = "";
        bool isFirst = false;
        if (dt.Rows.Count != 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
   &