Pass multiple values in single QueryString using LinkButton in ASP.Net GridView using C#

<ItemTemplate>
<asp:LinkButton ID="Link" runat="server" PostBackUrl='<%#"~/expo_crm/invoice/payment_receipt.aspx?id="+Eval("Sno")%>'>View</asp:LinkButton>
</ItemTemplate>

I know this is a basic question but i always had problems with session and querystrings.In postbackurl,i wanted to pass invoiceid value to payment receipt webform.