c# - Display Modal Popup On Button Click -

i want show modal popup after click save button save values in db , while showing modal popup, should continue saving, without closing modal popup using code

protected void btsave_click(object sender, eventargs e)         {             modalpopupextender1.show(); //my code  } 

and aspx code

<input type="button" runat="server" id="btmodel" style="display: none" />   <ajaxtoolkit:modalpopupextender id="modalpopupextender1" runat="server" targetcontrolid="btmodel"         popupcontrolid="panel1" popupdraghandlecontrolid="popupheader" drag="true" dropshadow="true"         okcontrolid="okbutton" cancelcontrolid="cancelbutton" backgroundcssclass="modalpopupbg">     </ajaxtoolkit:modalpopupextender>     <asp:panel id="panel1" style="display: none" runat="server">         <div class="progress-popup">             <div class="potit">                 saving             </div>             <img src="/images/prog.png" alt="" style="margin: 0 auto; display: block;" />             <div class="potit-cancel">                 <span class="cncl">                     <asp:button id="btnokay" runat="server" text="ok" onclick="btnokay_click" validationgroup="vg"                         cssclass="popupcancl" />                 </span>             </div>         </div>     </asp:panel> 

with code, first saving data in db, showing modalpopup

add hidden field on page. assign value (let say, 'showed') when press button , then, in page_load, string.compare, see if value of hidden field 'showed'. if is, show again modal control. when press cancel button, delete value hidden field (make string.empty).