<div id="buy" runat="server">
<input type="hidden" name="cmd" value="_xclick" />
<input type="hidden" name="business" value="This email address is being protected from spambots. You need JavaScript enabled to view it." />
<input type="hidden" name="item_name" value="Message_Encryption" />

<input type="hidden" name="cancel_return" value="http://www.csharpersworld.com/Home.aspx" />

<input type="hidden" name="custom" value="<%=UserId %>" />

<asp:HyperLink ID="buyButton" NavigateUrl="javascript:theForm.__VIEWSTATE.value='';
theForm.encoding='application/x-www-form-urlencoded';theForm.action=
'https://www.paypal.com/cgi-bin/webscr';theForm.submit();" ImageUrl="https://www.paypal.com/en_US/i/btn/btn_buynowCC_LG.gif" runat="server">