Pay Pal while using cart in c#.net

<form id="form1" runat="server" action="https://www.sandbox.paypal.com/cgi-bin/webscr">
   <div>
       <asp:Image ID="Image1" runat="server" Height="154px" ImageUrl="~/bike.jpg"
           Width="284px" />
       <br />
       Name :
       <asp:Literal ID="ltr_bikename" runat="server"></asp:Literal>
       <br />
       Price :
       <asp:Literal ID="ltr_bikeprice" runat="server"></asp:Literal>
       <br />
       <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/button.gif"
           onclick="ImageButton1_Click" />
           <input type="hidden" name="cmd" value="_xclick" />
   <input type="hidden" name="business" value="*********@gmail.com" />

   <input type="hidden" name="item_name" value="<% Response.Write(ltr_bikename.Text.ToString()); %>" />
   <input type="hidden" name="amount" value="<%  Response.Write(ltr_bikeprice.Text.ToString()); %>" />
   <input type="hidden" name="shipping" value="3.00" />
   <input type="hidden" name="handling" value="2.00" />
   </div>
   </form>