c# - UpdateProgress not working on secound click -


updateprogress works on first button click . when click second time updateprogress didn't appeared.instead of updateprogress things works on second click. please me..

   <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: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> <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="upload" style="display: none" />         <% 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> <asp:updatepanel id="updatepanel1" runat="server">     <contenttemplate>         <div class="form-group row">             <div class="col-sm-6">                 <div class="col-sm-6">                     <asp:button id="btnsubmit" onclick="btnsubmit_click"                         onclientclick="javascript:return btnsubmit();" cssclass="btn btn-primary"                         runat="server" text="submit" />                     <a href="assignment.aspx?sid=<%=request.querystring["sid"] %>" class="btn btn-default">cancel</a>                 </div>             </div>         </div>     </contenttemplate> </asp:updatepanel>

code behind

updprogress.visible = true; sendemail(convert.toint32(drpdiv.text)); updprogress.visible = false; txtassignmenttitle.text = ""; txtassignmentdes.text = ""; txtdategiven.text = ""; txtdatesubmit.text = ""; viewstate["image"] = null; viewstate["imagename"] = null; drpassignmenttype.items.clear(); drpclass.items.clear(); drpdiv.items.clear(); drpsubject.items.clear(); drpsubject.items.insert(0, new listitem("--select--", "0")); drpassignmenttype.items.insert(0, new listitem("--select--", "0")); loadclass(); loadclassandassignmenttype(); drpdiv.items.insert(0, new listitem("--select--", "0"));

i using update panel avoid page load .also updateprogress didn't appeared if try reload page using response.redirect . please me ..


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