asp.net dataTable添加列

DataTable dtNew = new DataTable();
dtNew.Columns.Add("ItemNo");//序列号列
dtNew.Columns.Add("flowname");
dtNew.Columns.Add("flowcontent");
dtNew.Columns.Add("bussinessflowid");
int p = 1;
for (int i = 0; i < dtOld.Rows.Count; i++)
{
DataRow dr = dtNew.NewRow();
dr["ItemNo"] = (p++).ToString();
dr["flowname"] = dtOld.Rows[i]["flowname"].ToString();
dr["flowcontent"] = dtOld.Rows[i]["flowcontent"].ToString();
dr["bussinessflowid"] = dtOld.Rows[i]["bussinessflowid"].ToString();
dtNew.Rows.Add(dr);
}

datalist.DataSource = dtNew;
datalist.DataBind();