Display query result in Label using C# in ASP.Net

in below code label is not returning value.

so please help me

                var ddl_Comp = ddl_comp.SelectedItem.Text;
                var Nozzle_price = lbl_nprice.Text;
                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Mycon"].ToString());
                con.Open();
                SqlCommand cmd = new SqlCommand("select nozzle_lph FROM company_sprinkler_data WHERE company_email = @ddl_Comp and nozzle_price = @Nozzle_price",con);
                cmd.Parameters.AddWithValue("@ddl_Comp", ddl_Comp);
                cmd.Parameters.AddWithValue("@Nozzle_price", Nozzle_price);
                SqlDataReader dr = cmd.ExecuteReader();
                if (dr.Read() == true)
                {
                    Label1.Text = dr["nozzle_lph"].ToString();
                }
                con.Close();