c# - TextChanged event does not fire when 2nd modification equals the original value -

i have _textchanged event works except in specific circumstance can replicated follows:

1. user modifies text (event fires correctly)
2. user modifies text again match original value (event doesn't fire)

i can _textchanged event work on development box turning on viewstate update panel on ascx page, when move server error viewstate failed if switch user controls , switch page. controls go inside update panel build dynamically in code behind , rebuilt each postback -- works every other postback don't think issue controls.

additionally, turning on viewstate makes page run dreadfully slow anyway, not ideal fix.

finally, _textchanged event works changes except when reverting original value.

can tell me why event doesn't fire in specific circumstance, , how address problem?

text box creation in code behind:

 textbox annualhourstextbox = new textbox();  annualhourstextbox.id = string.format("bundle{0}_annualhourstextbox{1}", bundle.bundlenbr, parentitem.laboritemnbr);  annualhourstextbox.cssclass = "";  annualhourstextbox.columns = 4;  annualhourstextbox.text = childitem == null ? string.empty : childitem.ftehours.tostring("f0");  annualhourstextbox.autopostback = true;  annualhourstextbox.textchanged += new eventhandler(annualhourstextbox_textchanged);   asyncpostbacktrigger ahtrigger = new asyncpostbacktrigger();  ahtrigger.controlid = annualhourstextbox.uniqueid;  ahtrigger.eventname = "textchanged";  uppricingsheet.triggers.add(ahtrigger);   //snip   //add attributes reference on events  annualhourstextbox.attributes["othercontrol"] = tasksperyeartextbox.uniqueid;  annualhourstextbox.attributes["nextcontrol"] = benefitstextbox.uniqueid;  annualhourstextbox.attributes["targettbcontrol"] = tasktimetextbox.uniqueid;  annualhourstextbox.attributes["targetddlcontrol"] = tasktimeuomdropdown.uniqueid; 

event handler:

protected void annualhourstextbox_textchanged(object sender, eventargs e) {     textbox ah = sender textbox;     textbox other = page.findcontrol(ah.attributes["othercontrol"]) textbox;      if ((!string.isnullorempty(ah.text)) && (!string.isnullorempty(other.text)))      {         textbox next = page.findcontrol(ah.attributes["nextcontrol"]) textbox;         textbox targettb = page.findcontrol(ah.attributes["targettbcontrol"]) textbox;         dropdownlist ddl = page.findcontrol(ah.attributes["targetddlcontrol"]) dropdownlist;         double taskspersecond;          taskspersecond = calculatetimepertask(ah.text, other.text);         string timeunit;         double time;          if (taskspersecond < 60)         {             timeunit = "seconds";             time = taskspersecond;         }         else if (taskspersecond < 3600)         {             timeunit = "minutes";             time = (taskspersecond / 60);         }         else         {             timeunit = "hours";             time = (taskspersecond / 60 / 60);         }          //enter time in appropriate textbox         targettb.text = time.tostring("f2");          //select appropriate item ddl         listitem = ddl.items.findbytext(timeunit);          if (i != null)         {             ddl.selecteditem.selected = false;             i.selected = true;         }     } } 

aspx page:

<%@ page title="" language="c#" masterpagefile="~/masterpage.master" autoeventwireup="true" codefile="solution.aspx.cs" inherits="solution" %>  <%@ register src="fragments/solutionrecommended.ascx" tagname="solutionrecommended" tagprefix="uc1" %> <%@ register src="fragments/solutionpricingsheet.ascx" tagname="solutionpricingsheet" tagprefix="uc2" %> <%@ register src="fragments/solutionsuggested.ascx" tagname="solutionsuggested" tagprefix="uc3" %> <%@ register src="fragments/solutionsummary.ascx" tagname="solutionsummary" tagprefix="uc4" %> <%@ register src="fragments/ucitemfiltersearch.ascx" tagname="ucitemfiltersearch" tagprefix="uc5" %>  <asp:content id="content1" contentplaceholderid="head" runat="server"> <script type="text/javascript">     function additemtobundle(posturl, redirecturl) {         $.post(posturl);         window.location = redirecturl;         //  window.location = url;     }  </script> </asp:content> <asp:content id="content2" contentplaceholderid="contentplaceholder1" runat="server"> <asp:hiddenfield id="hfstepnbr" runat="server" /> <asp:panel id="pnlstepmessage" runat="server" visible="false" cssclass="padding10">     <h3 class="placeholder">         <asp:label id="lblmessage" runat="server" /></h3> </asp:panel> <div class='elev8form' id="maindiv" runat="server">     <h3 class='header'>         solutions</h3>     <div id="tabs">         <div class='tab'>             <asp:linkbutton id="lbsuggested" runat="server" text="select items" data-step="1"                 onclick="lbtab_click" causesvalidation="false"></asp:linkbutton>         </div>         <div class='tab'>             <asp:linkbutton id="lbpricing" runat="server" text="pricing worksheet" data-step="2"                 onclick="lbtab_click" ></asp:linkbutton>         </div>         <div class='tab'>             <asp:linkbutton id="lbrecommendedsolutions" runat="server" text="recommended solutions"                 data-step="3" onclick="lbtab_click" causesvalidation="false"></asp:linkbutton>         </div>         <div class='tab'>             <asp:linkbutton id="lbsummary" runat="server" text="solutions summary" data-step="4"                 onclick="lbtab_click" causesvalidation="false"></asp:linkbutton>         </div>     </div>     <div id="solutions-body">         <asp:multiview id="mltsolution" runat="server">             <asp:view id="viewsuggested" runat="server">                 <uc3:solutionsuggested id="solutionsuggested1" runat="server" redirecturl="~/portal/elev8/solution.aspx" />             </asp:view>             <asp:view id="viewpricing" runat="server">                 <uc2:solutionpricingsheet id="solutionpricingsheet1" runat="server" />             </asp:view>             <asp:view id="viewrecommended" runat="server">                 <uc1:solutionrecommended id="solutionrecommended1" runat="server" />             </asp:view>             <asp:view id="viewsummary" runat="server">                 <p style="font-size: 14px;">                     text here                  </p>                 <uc4:solutionsummary id="solutionsummary1" runat="server" />             </asp:view>         </asp:multiview>     </div> </div> <script type="text/javascript">     function pageload() {         $(function () {              var maxchannelheight;              var items = $('.channel');              (var counter = 0; counter < items.length; counter++) {                 var channel = items[counter];                  var channelheight = $(channel).height();                  maxchannelheight = maxchannelheight > channelheight ? maxchannelheight : channelheight;             }              $('.channel').height(maxchannelheight);              $("#priceing-sheet-save-button *").click(function () {                 window.scrollto(0, 0);              });         });     }  </script> 

ascx page:

<%@ control language="c#" autoeventwireup="true" codefile="solutionpricingsheet.ascx.cs" inherits="solutionpricingsheet" %>  <asp:updateprogress id="upprogressrecsolution" runat='server' associatedupdatepanelid="uppricingsheet"> <progresstemplate>     <div style="position: absolute; z-index: 2000; left: 45%; display: inline; width: 100px;"         class="elev8form">         <asp:image id="image1" runat='server' imageurl="~/portal/img/ajax-loader-big.gif" />     </div> </progresstemplate> </asp:updateprogress> <div id="pricing-sheet-wrapper"> <p class='left'>     more text</p> <asp:panel id="pnlsavemessage" runat="server" visible="false" cssclass="save-message">     <span>item prices saved</span> </asp:panel> <div class='export'>     <span class='bigbutton'>         <asp:linkbutton id="btnexport" runat='server' text="export excel" onclick="btnexport_click" />     </span> </div> <asp:updatepanel id="uppricingsheet" runat="server" updatemode="conditional" viewstatemode="disabled">     <contenttemplate>         <div id="pricing-sheet">                     <asp:placeholder id="phcontent" runat="server"></asp:placeholder>             <asp:placeholder id="opportunityplaceholder" runat="server" />             <div class='save export'>                 <div>                     <div id="pagevalidationerror" class="validationmessage">                        * changes not saved. review entries validation messages. required fields marked asterisk.                     </div>                 </div>                 <%--<asp:hiddenfield id="hf" runat="server" value="0" />--%>                 <center>                     <span id="priceing-sheet-save-button">                     <asp:button id="btnsave" runat="server" text="save prices" skinid="redbutton"                         onclick="btnsave_click" causesvalidation="true" />                     </span>                 </center>             </div>         </div>         <script type="text/javascript">             function pageload() {                  $("#tabs .tab a").click(function () {                     $("#<%= btnsave.clientid%>").click();                 });             }         </script>     </contenttemplate> </asp:updatepanel> </div>     <script type="text/javascript"> $(document).ready(function () {     $('.validationmessage').hide();      $('#<%= btnsave.clientid %>').click(function () {         if (page_isvalid == false) {             $('.validationmessage').show();             return false;         }     });      $('input[type=text]').blur(function () {         if (page_isvalid == false) {             $('.validationmessage').show();             return false;         }         else {             $('.validationmessage').hide();         }     }) }); 

that intended behavior - event called ontextchanged (different original) not ontexttyped (any text entered), have handle event (which triggers if nothing @ entered):

onblur="__dopostback(this.id, '');"

update: pretty simple actually, since using ajax, textbox's .defaultvalue not changing between postbacks, .value - either use onblur told you, or on every postback change .defaultvalue .value in javascript: http://www.w3schools.com/jsref/prop_text_defaultvalue.asp

or place textbox in updatepanel, , take care of self on own...

update 2: first off, in code textbox shown inside `updatepanel', , secondly, have 3 choices:

a) onblur method work, remove autopostback property (it client side onchange event), keep ontextchanged event (it server side).

b) viewstate method work, set viewstatemode="enabled" on textbox, , make sure using viewstatemode="disabled" on containers - , not enableviewstate="false".

c) javascript .defaultvalue method...