c# - UpdateProgress not working second time after image uploads -


updateprogress appears when btnsubmit click in second time after upload image updateprogress not appears . if didn't upload image update progress appears . , found second time after image uploads contentplaceholder1_updprogress disappeared console. otherwise(no image uploads in second time) contentplaceholder1_updprogress in console. think issue image upload in second time. @ first click every thing ok.

my aspx

<asp:updatepanel id="updatepanel2" runat="server">     <triggers>         <asp:asyncpostbacktrigger controlid="btnsubmit" />     </triggers>     <contenttemplate>         <div class="form-group row">             <div class="col-sm-6">                 <p style="margin: 0 0 5px 0;"><b>class</b></p>                 <asp:dropdownlist id="drpclass" cssclass="form-control" onselectedindexchanged="drpclass_selectedindexchanged" autopostback="true" runat="server"></asp:dropdownlist>             </div>             <div class="col-sm-6">                 <p style="margin: 0 0 5px 0;"><b>division</b></p>                 <asp:dropdownlist id="drpdiv" cssclass="form-control"                     runat="server">                 </asp:dropdownlist>             </div>         </div>         <div class="form-group row">             <div class="col-sm-6">                 <p style="margin: 0 0 5px 0;"><b>date</b></p>                 <asp:textbox runat="server" id="txtdategiven" cssclass="form-control"                     placeholder="select date"></asp:textbox>                 <asp:calendarextender id="calendarextender2" runat="server" format="dd/mmm/yyyy" popupbuttonid="txtdategiven"                     targetcontrolid="txtdategiven">                 </asp:calendarextender>             </div>              <div class="col-sm-6">                 <p style="margin: 0 0 5px 0;"><b>date of submission</b></p>                 <asp:textbox runat="server" id="txtdatesubmit" cssclass="form-control"                     placeholder="select date"></asp:textbox>                 <asp:calendarextender id="calendarextender1" runat="server" format="dd/mmm/yyyy" popupbuttonid="txtdatesubmit"                     targetcontrolid="txtdatesubmit">                 </asp:calendarextender>             </div>         </div>          <div class="form-group row">             <div class="col-sm-12">                 <p style="margin: 0 0 5px 0;"><b>subject</b></p>                 <asp:dropdownlist id="drpsubject" cssclass="form-control" runat="server"></asp:dropdownlist>             </div>         </div>         <div class="form-group row">             <div class="col-sm-12">                 <p style="margin: 0 0 5px 0;"><b>type</b></p>                 <asp:dropdownlist id="drpassignmenttype" cssclass="form-control" runat="server"></asp:dropdownlist>             </div>         </div>         <div class="form-group row">             <div class="col-sm-12">                 <p style="margin: 0 0 5px 0;"><b>title</b></p>                 <asp:textbox id="txtassignmenttitle" cssclass="form-control" placeholder="enter title"                     runat="server"></asp:textbox>             </div>         </div>         <div class="form-group row">             <div class="col-sm-12">                 <p style="margin: 0 0 5px 0;"><b>description</b></p>                 <asp:textbox id="txtassignmentdes" cssclass="form-control" textmode="multiline" height="250"                     placeholder="enter description"                     runat="server"></asp:textbox>             </div>         </div>     </contenttemplate> </asp:updatepanel> <asp:updatepanel id="updatepanel3" runat="server">     <triggers>         <asp:postbacktrigger controlid="btnupload" />     </triggers>     <contenttemplate>         <div class="form-group row">             <div class="col-sm-6">                 <p style="margin: 0 0 5px 0;"><b>upload file</b></p>                 <asp:fileupload id="imgphoto" runat="server" />                 <br />                 <asp:button id="btnupload" text="upload" runat="server" onclick="btnupload_click"  />                 <% if (viewstate["image"] != null)                     {%>                 <a target="_blank" href="<%=viewstate["imagename"]%>">view attachment</a>                 <%}                     else                     { %>                 <asp:label id="label1" runat="server" forecolor="red" text="no file uploaded"></asp:label>                 <%} %>             </div>         </div>     </contenttemplate> </asp:updatepanel> <asp:updateprogress id="updprogress" associatedupdatepanelid="updatepanel1"     runat="server">     <progresstemplate>         <div class="modal">             <div class="center">                 <span style="padding-left: 10px"><b>please wait..</b></span>                 <img alt="" src="../images/preloader_3.gif" width="50" height="50" />             </div>         </div>     </progresstemplate> </asp:updateprogress> <asp:updatepanel id="updatepanel1" runat="server">     <triggers>         <asp:asyncpostbacktrigger controlid="btnsubmit" eventname="click" />     </triggers>     <contenttemplate>         <div class="form-group row">             <div class="col-sm-6">                 <div class="col-sm-6">                     <asp:button id="btnsubmit" onclick="btnsubmit_click"                         cssclass="btn btn-primary" onclientclick="javascript:return btnsubmit();"                         runat="server" text="submit" autopostback="true" />                     <a href="assignment.aspx?sid=<%=request.querystring["sid"] %>" class="btn btn-default">cancel</a>                 </div>             </div>         </div>     </contenttemplate> </asp:updatepanel> </div>

code behind

   protected void btnsubmit_click(object sender, eventargs e)     {         updprogress.visible = true;        sendemail(convert.toint32(drpdiv.text));        updprogress.visible = false;     }

may repeated question need solve issue

remove code behind 

updprogress.visible = true; updprogress.visible = false;

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