查询数据表行数 然后循环查找表 添加数据到ITEMS

for( int i=0;i<tbBiao.Rows.Count;i++)
            {
            string TableName = (tbBiao.Rows[i]["Table"]).ToString();
            tbDn = GetAccessData(TableName);
            DnList = tbDn.AsEnumerable().Select(p => p.Field<double>("DN").ToString()).Distinct().ToList();
            cbbDn.Items.AddRange(DnList.ToArray());
            }