C#新手求解 ZedGraph实现曲线有关问题

private void InitializeComponent()    {       this.ZedGraphWeb1.RenderGraph += new ZedGraphWebControlEventHandler(this.OnRenderGraph1);       this.Load += new System.EventHandler(this.Page_Load);     }private void OnRenderGraph1(ZedGraphWeb zgw, Graphics g, MasterPane masterPane)    {        GraphPane myPane = masterPane[0];        myPane.YAxis.Scale.Max = 60;        myPane.YAxis.Scale.Min = 0;        myPane.XAxis.MajorGrid.IsVisible = true;        myPane.YAxis.MajorGrid.IsVisible = true;        myPane.XAxis.MajorGrid.Color = Color.LightGray;        myPane.YAxis.MajorGrid.Color = Color.LightGray;        myPane.XAxis.MajorGrid.DashOff = 0;        myPane.YAxis.MajorGrid.DashOff = 0;        myPane.YAxis.Scale.BaseTic = -40;           myPane.XAxis.Scale.MajorStep = 10;        myPane.XAxis.Scale.MinorStep = 2.5;            myPane.YAxis.Scale.MajorStep = 10;        myPane.YAxis.Scale.MinorStep = 2.5;        myPane.YAxis.Scale.IsVisible = true;        myPane.Title.Text = "温度曲线图";        myPane.XAxis.Title.Text = "时间";        myPane.YAxis.Title.Text = "温度";        DataSourcePointList dspl = new DataSourcePointList();        dspl.DataSource = GetData().Tables[0];         dspl.XDataMember = "Timestamp";        dspl.YDataMember = "Air_Temperature";        dspl.ZDataMember = null;        LineItem myCurve2 = myPane.AddCurve("温度℃", dspl, Color.LightGray, SymbolType.Plus);        myPane.XAxis.Type = AxisType.Date;        myPane.XAxis.CrossAuto = true;        myPane.Chart.Fill = new Fill(Color.Black, Color.Black, 45F);        masterPane.AxisChange(g);   }private void BindData()    {        SqlConnection sqlcon = new SqlConnection();        try        {            sqlcon.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["DB_CON"].ConnectionString;            sqlcon.Open();            SqlCommand sqlcom = new SqlCommand();            sqlcom.Connection = sqlcon;            sqlcom.CommandText = "select top 10  Air_Temperature as 气温 from Weather  order by Timestamp desc";             sqlcom.CommandType = CommandType.Text;            SqlDataAdapter sqlda = new SqlDataAdapter(sqlcom);            ds = new DataSet();            sqlda.Fill(ds);            GridView1.DataSource = ds.Tables[0];            GridView1.DataBind();        }        catch (Exception ex)        {            throw (ex);        }        finally        {            sqlcon.Close();        }    }protected void Page_Load(object sender, EventArgs e)    {       if (!IsPostBack)        {         BindData();        }        InitializeComponent();    }