c# - aspx page not load in iframe click on button -


<asp:button runat="server" id="hiddenpopuppatientregistration" style="display: none" />     <asp:modalpopupextender id="popuppatientregistration" runat="server" popupcontrolid="panelpatientregistration"         targetcontrolid="hiddenpopuppatientregistration" backgroundcssclass="cssmodalbackground"         behaviorid="modalbehaviour" cancelcontrolid="btnclose">     </asp:modalpopupextender>     <div id="panelpatientregistration" class="cssmodalpopup" style="display: none">         <iframe id="iframepatientregistration"  class="csstable" runat="server" width="600px"             height="485px" scrolling="auto"></iframe>         <table>             <tr>                 <td align="right">                     <asp:button id="btnclose" runat="server" cssclass="cssbutton" text="close" />                 </td>             </tr>         </table>     </div>      protected void btn_click(object sender, eventargs e)     {           iframepatientregistration.attributes["src"] = "patient_registration.aspx?flowtype=" + flowtype + "&fromtime=" + hidfromtime.value + "&totime=" + hidtotime.value + "&acqmodalityid=" + hidacqmodalityid.value + "&schlocationid=" + ddlscheduledproceduresteplocation.selectedvalue;             popuppatientregistration.show();     } 

i have show aspx page in modal popup extender control. , pass values through query string aspx page not loads in iframe.code behind.

when see html source getting these 2 lines

<html> </html> 

the display property containing div "panelpatientregistration" set none. iframe inside , never gets rendered.


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