System.FormatException: Input string was not in a correct format.
at System.Number.ParseDouble(String value, NumberStyles options, NumberFormatInfo numfmt)
at System.Convert.ToDouble(String value)
at pagina.calcolaCostoSpedizione(String id_articolo) in http://server/pagina.aspx.cs:line 8592
at pagina.Page_Load(Object sender, EventArgs e) in http://server/pagina.aspx.cs:line 4088
Bordatore Aspire T28-P4A