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   [Ajax.AjaxMethod()]
   public DataTable GetDataTable(string tablename)
   {
       DataTable Table=new DataTable();
              ...............
        return Table
   }
    window.onload=function(){
          ClassName.GetDataTable(tablename,GetDataTable_CallBack);
    }
    function GetDataTable_CallBack(res){
          var response=res.value;
                     .........//½¨Á¢table
    } 
    ÔÚÍøÉϲéÁËһϣ¬ËµDataTableÊÇ·þÎñÆ÷ÄÚ´æÖÐµÄ±í£¬²»ÄÜÓÃJSÏñRows[i][j]ÕâÑù·ÃÎÊ£¬ÒòΪAjax·µ»ØµÄDataTableÖеÄÁÐÃûÊDz»¹Ì¶¨µÄ£¬Õâ¸öÊǸù¾Ýtablename²ÎÊýÈ·¶¨µÄ£¬ÇëÄÄλÐÖµÜÖ¸µãÒ»¶þ£¬µ«ÊÇ×îºóÎÒÊÇÔÚ·þÎñÆ÷¶ËÉú³ÉµÄhtml´úÂ룬Ȼºó·µ»ØµÄÊÇ×Ö·û´®¶ø²»ÊÇDataTable.
    [Ajax.AjaxMethod()]
    public string  GetDataTable(string tablename)
    {
        string htmlstr = "";
        string sql = "select ...... where tablename='"+tablename+"'";
        DataTable Table = new DataTable();
        Table = DClass.GetDataTable(sql);
        for (int i = 0; i < Table.Rows.Count; i++)
        {
            htmlstr += "<tr>";
            for (int j = 0; j < Table.Columns.Count;


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