c# - Multiple identical forms on a page in asp.net. How do I get variables? -

i'm having trouble figuring out. can't explain well, here html/asp first:

<%for(int i=0; i<getcountrows(); i++)     {         setlabelsfestivals(i); %>     <form action="festival_details.aspx" method="post">         <table id="table_600px_border">             <tbody class="content_table_left" style='padding: 10px;'>                 <tr>                     <td class="content_table_300px content_table_left_up">                         <div class="text_bold">                             <asp:label id="namefestival" runat="server"></asp:label>                         </div>                         <asp:hiddenfield id="fest_id" runat="server" />                     </td>                     <td class="content_table_300px content_table_left_up_bottom">                         <asp:label id="startdatefestival" runat="server"></asp:label>                     </td>                 </tr>                 <tr>                     <td class="content_table_left_up">                         <asp:label id="locationfestival" runat="server"></asp:label>                     </td>                     <td class="content_table_left_up">                         <asp:label id="enddatefestival" runat="server"></asp:label>                     </td>                 </tr>                 <tr>                     <td class="content_table_left_up_bottom">                         <asp:hyperlink id="urlfestival" runat="server">site</asp:hyperlink>                     </td>                     <td class="content_table_right_bottom">                     <input type="submit" name="btndetails" value="details" />                     </td>                 </tr>             </tbody>         </table>     </form> <% } 

for each row in dataset, form dynamically created simple submit button. happens in code behind

//this method makes sure correct labels shown on screen protected void setlabelsfestivals(int positiondataset) {     //checking if data found bands     if (getcountrows() > 0)     {         datetime dtstartdate = convert.todatetime(datasetfestivals.tables[0].rows[positiondataset]["fest_datum"].tostring());         datetime dtenddate = convert.todatetime(datasetfestivals.tables[0].rows[positiondataset]["fest_einddatum"].tostring());          //showing festivals , data         namefestival.text = datasetfestivals.tables[0].rows[positiondataset]["fest_naam"].tostring();         fest_id.value = datasetfestivals.tables[0].rows[positiondataset]["fest_id"].tostring();         startdatefestival.text = "begindatum: " + dtstartdate.tostring("yyyy-mm-dd");         locationfestival.text = "locatie: " + datasetfestivals.tables[0].rows[positiondataset]["fest_locatie"].tostring();         enddatefestival.text = "einddatum: " + dtenddate.tostring("yyyy-mm-dd");         urlfestival.navigateurl = "http://" + datasetfestivals.tables[0].rows[positiondataset]["fest_url"].tostring();         urlfestival.target = "_blank";     } } 

so, how can example value of hidden field width id "fest_id" in festival_details.aspx? tried:

httpcontext variables = httpcontext.current; strformidfest = variables.request["fest_id"]; 

however, string strformidfest null. guess it's got clientid?

first off, asp.net webforms designed use 1 form per page. should consider using control repeater render your controls within same form.

anyhow. if looking (using breakpoint , quick watch) @ request variables should able find hidden field. not named "fest_id", got name containing page , control name , bunch of other characters. default way asp.net controls (like asp:hiddenfield).

you may force asp.net give control id if using asp.net 4.0 setting clientidmode static:

<asp:hiddenfield id="fest_id" runat="server" clientidmode="static" /> 

or may use standard html hidden control correct id cannot use code behind set value in case:

 <input type="hidden" name="fest_id" id="fest_id"> 

you should consider if loop in aspx way go. not standard way go in webforms. take @ repeater or control render complex markup.