postbackurl not working in Imagebutton

<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="images/icon-continue-shopping-4-150x49.jpg" PostBackUrl='<%#"Order_Details.aspx?pid="+Eval("ProductID") %>'/>

 protected void Page_Load(object sender, EventArgs e)
    {

        BindGridData();
        if (!IsPostBack)
        {
        }
    }
    protected void Button1_Click1(object sender, EventArgs e)
    {

    }
    private void BindGridData()
    {
        try
        {
            con.Open();
            int pitemid = Convert.ToInt32(Request.QueryString["pid"].ToString());
            {
                string sql = "select * from rsa_ProductItemTable where ProductID=" + pitemid;
                SqlCommand cmd = new SqlCommand(sql, con);
                SqlDataAdapter da = new SqlDataAdapter(sql, con);
                DataSet ds = new DataSet();
                da.Fill(ds);
                GridView1.DataSource = ds;
                GridView1.DataBind();
            }
        }

        catch (Exception ex)
        {
        }
        finally
        {
            con.Close();
        }
    }
}