asp.net - Page refreshing when attempting to save TextBox values -


i have table textboxes , set updatepanel table , set button should save new textboxes' value database trigger. but, when press button page refreshes.

<%@ page title="" language="c#" masterpagefile="~/maestromaster.master" autoeventwireup="true"     codefile="projectdetails.aspx.cs" inherits="default" enableeventvalidation="false" %>  <asp:content id="content1" contentplaceholderid="contentplaceholder2" runat="server">     <style type="text/css">         .style1         {             height: 68px;         }     </style> </asp:content> <asp:content id="content2" contentplaceholderid="contentplaceholder3" runat="server"> <asp:scriptmanager id="scriptmanager"  runat="server"></asp:scriptmanager>         <div class="cntr">         <h1>             פרטי הלקוח         </h1>     </div>     <br />     <asp:updatepanel id="customerupdatepanel">    <contenttemplate>      <table id="customerdetailstbl" class="table">         <tr>             <td>                 <div class="input-group">                     <input id="projectinfoid" type="text" class="form-control" runat="server" maxlength="9">                     <span class="input-group-addon">ת.ז</span>                 </div>             </td>             <td>                 <div class="input-group">                     <input id="projectinfoaddress" type="text" class="form-control" runat="server" maxlength="30">                     <span class="input-group-addon">כתובת</span>                 </div>             </td>         </tr>         <tr>             <td>                 <div class="input-group">                     <input id="projectinfofirstname" type="text" class="form-control" runat="server"                         maxlength="15">                     <span class="input-group-addon">שם פרטי</span>                 </div>             </td>             <td>                 <div class="input-group">                     <input id="projectinfocity" type="text" class="form-control" runat="server" maxlength="15">                     <span class="input-group-addon">עיר</span>                 </div>             </td>         </tr>         <tr>             <td>                 <div class="input-group">                     <input id="projectinfolastname" type="text" class="form-control" runat="server" maxlength="15">                     <span class="input-group-addon">שם משפחה</span>                 </div>             </td>             <td>                 <div class="input-group">                     <input id="projectinfoemail" type="text" class="form-control" runat="server">                     <span class="input-group-addon">דוא"ל</span>                 </div>             </td>         </tr>         <tr>             <td>                 <div class="input-group">                     <input id="projectinfophone" type="text" class="form-control" runat="server" maxlength="10">                     <span class="input-group-addon">טלפון</span>                 </div>             </td>             <td>                 <div class="input-group">                     <input id="projectinfofax" type="text" class="form-control" runat="server" maxlength="10">                     <span class="input-group-addon">פקס</span>                 </div>             </td>         </tr>         <tr>             <td>                 <div class="input-group">                     <input id="projectinfomobile" type="text" class="form-control" runat="server" maxlength="10">                     <span class="input-group-addon">טלפון נייד</span>                 </div>             </td>             <td>             </td>         </tr>         <tr>             <td>                 <div class="input-group">                     <input id="projectinfoarchitectname" type="text" class="form-control" runat="server"                         maxlength="15">                     <span class="input-group-addon">שם האדריכל</span>                 </div>             </td>             <td>                 <div class="input-group">                     <input id="projectinfoarchitectmobile" type="text" class="form-control" runat="server"                         maxlength="10">                     <span class="input-group-addon">טלפון אדריכל</span>                 </div>             </td>         </tr>         <tr>             <td>                 <div class="input-group">                     <input id="projectinfocontractorname" type="text" class="form-control" runat="server"                         maxlength="15">                     <span class="input-group-addon">שם הקבלן</span>                 </div>             </td>             <td>                 <div class="input-group">                     <input id="projectinfocontractorphone" type="text" class="form-control" runat="server"                         maxlength="10">                     <span class="input-group-addon">טלפון קבלן</span>                 </div>             </td>         </tr>         <tr>             <td>                 <div class="input-group">                     <input id="projectinfosupervisorname" type="text" class="form-control" runat="server"                         maxlength="15">                     <span class="input-group-addon">שם המפקח</span>                 </div>             </td>             <td>                 <div class="input-group">                     <input id="projectinfosupervisorphone" type="text" class="form-control" runat="server"                         maxlength="10">                     <span class="input-group-addon">טלפון מפקח</span>                 </div>             </td>         </tr>     </table>    </contenttemplate>    <triggers>    <asp:asyncpostbacktrigger controlid="contentplaceholder3_savecustomerdetailsbtn" eventname="click"/>    </triggers>    </asp:updatepanel>

you not have button inside updatepanel trigger dynamic update of updatepanel content only, , control id make trigger not exist contentplaceholder3_savecustomerdetailsbtn in code give


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