各位高手帮帮忙，以下问题要如何解决
编译器错误消息: CS1061: “System.Data.DataRow”不包含“SeriesID”的定义，并且找不到可接受类型为“System.Data.DataRow”的第一个参数的扩展方法“SeriesID”(是否缺少 using 指令或程序集引用?)

源错误:

 

行 62:             //查询
行 63:             var gz = from p in Sunlord101.AsEnumerable()
行 64:                      [font color=#0000FF]where p.SeriesID = "10101"
[/font]行 65:                      select p;
行 66:             foreach (DataRow p in gz)
 
源码是：
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            GetDataSet();
        }
    }

    private void GetDataSet()
    {
        SqlConnection sqlcon = new SqlConnection();
        SqlDataAdapter sda;
        DataSet ds = new DataSet();
        string sqlconstr = "Data Source=...;Initial Catalog=...;User ID=sa;Password=******";
        sqlcon.ConnectionString = sqlconstr;
        String sqlcmd = "SELECT SeriesID, TypeID, application, impedance, imp, DR, RC, LW, thickness FROM dbo.Sunlord101";
        using (sda = new SqlDataAdapter(sqlcmd, sqlcon))
        {
            try
            {
                sda.Fill(ds, "Sunlord101");
                Session["ds"] = ds;
            }
            catch (SystemException ex)
            {
                Response.Write(ex.Message.ToString());
            }
        }
        GridView1.DataSource = ds.Tables["Sunlord101"].DefaultView;
        GridView1.DataBind();
    }

   
    protected void lnkbtnGz_Click(object sender, EventArgs e)
    {
        DataSet ds = (DataSet)Session["ds"];
        //对表中的字符串的区域信息进行设置，将不依赖于区域性
        ds.Locale = CultureInfo.InvariantCulture;
        //取得DataTable
        DataTable Sunlord101 = ds.Tables["Sunlord101"];
        try
        {
            //查询
            var gz = from p in Sunlord101.AsEnumerable()
                     where p.SeriesID = "10101"
                     select p;
            foreach (DataRow p in gz)
            {
                Response.Write(p.Field<int>("SeriesID")+"..." + p.Field<string>("TypeID") + "..."
                    + p.Field<string>("application") + "..." + p.Field<string>("impedance") + "..."
                    + p.Field<string>("imp") + "..." + p.Field<float>("DR") + "..."
                    + p.Field<int>("RC") + "..." + p.Field<string>("LW") + "..."
                    + p.Field<float>("thickness"));
                Response.Write("<br>");
            }
            GridView1.Visible = false;
        }
        catch (InvalidCastException iex)
        {
            Response.Write(iex.Message.ToString());
        }
        catch (IndexOutOfRangeException oex)
        {
            Response.Write(oex.Message.ToString());
        }
        catch (NullReferenceException nex)
        {
            Response.Write(nex.Message.ToString());
        }
    }


    protected void lnkbtnSz_Click(object sender, EventArgs e)
    {
        DataSet ds = (DataSet)Session["ds"];
        ds.Locale = CultureInfo.InvariantCulture;
        DataTable Sunlord101 = ds.Tables["Sunlord101"];
        try
        {
            var sz = from p in Sunlord101.AsEnumerable()
                     where p.SeriesID = "10102"
                     select p;
            foreach (DataRow p in sz)
            {
                Response.Write(p.Field<string>("TypeID") + "..."
                    + p.Field<string>("application") + "..." + p.Field<string>("impedance") + "..."
                    + p.Field<string>("imp") + "..." + p.Field<float>("DR") + "..."
                    + p.Field<int>("RC") + "..." + p.Field<string>("LW") + "..."
                    + p.Field<float>("thickness"));
                Response.Write("<br>");
            }
            GridView1.Visible = false;
        }
        catch (InvalidCastException iex)
        {
            Response.Write(iex.Message.ToString());
        }
        catch (IndexOutOfRangeException oex)
        {
            Response.Write(oex.Message.ToString());
        }
        catch (NullReferenceException nex)
        {
            Response.Write(nex.Message.ToString());
        }
    }

    protected void lnkbtnPz_Click(object sender, EventArgs e)
    {
。。。。。。
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