gridview not populating... asp.net c#

public partial class Default3 : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ROD_July18ConnectionString"].ToString());
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            LoadData();
        }
    }
    private void LoadData()
    {
        var da = new SqlDataAdapter("SELECT * FROM t08MedCenter", con);
        var ds = new DataSet();
        da.Fill(ds);
        grdHighLight.DataBind();
    }
}
----------------------------
   <form id="form1" runat="server">
    <div>
    <asp:GridView runat="server" ID="grdHighLight" >
            
    </asp:GridView>
    </div>
    </form>

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