How to prevent shocked website?

<connectionStrings>
		<add name="sPhone" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=PhoneMgr;Integrated Security=True" providerName="System.Data.SqlClient"/>
</connectionStrings>

SqlConnection scon = new SqlConnection();
    SqlCommand cmd = new SqlCommand();
    SqlDataReader sdr;
    public void OpenConnect()
    {
        string con =    WebConfigurationManager.ConnectionStrings["sPhone"].ToString();
        if (scon.State == ConnectionState.Closed)
        {
            scon.ConnectionString = con;
            scon.Open();
        }
    }
    public DataTable GetTable(string sql, params SqlParameter[] pars)
    {
        DataTable tb = new DataTable();
        try
        {
            cmd.Connection = scon;
            cmd.CommandText = sql;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Clear();
            cmd.Parameters.AddRange(pars);
            OpenConnect();
            sdr = cmd.ExecuteReader();
            tb.Load(sdr);
            sdr.Close();
            scon.Close();
        }
        catch
        {
        }
        return tb;
    }

<asp:Image ID="img" runat="server" height="160px" 
            ImageUrl='<%# "~/Image/" + Eval("Image") %>' width="160px" /><br/>

<a href='ProductDetail.aspx?id=<%#Eval("idProduct") %>'>Detail</a> 
<pre lang="c#"><asp:LinkButton ID="addCart" runat="server" 
                         CommandName="Select" Text="Buy" ></asp:LinkButton>

Product = new Product();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            // DataList1.DataSource = dt;
            ShowProduct();
        }
    }
protected void DataList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        Label lbg = (Label)DataList1.Items[DataList1.SelectedIndex].FindControl("lblidProduct");
        lblSelected.Text=lbg.Text;
    }