Hello ,
I am working on telerik ListView with RadDatapager . RadDatapager event is not (fire) working on first click. Event working on second click. I send my code below: 
<%@ Page Language="C#" ValidateRequest="false" EnableEventValidation="false" CodeBehind="UIPeople.aspx.cs"     Inherits="myDoxii_WebRole.UIPeople" %>   <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">     <title></title>     <link href="App_Themes/CustomTabStrip/TabStrip.CustomTabStrip.css" rel="stylesheet"        type="text/css" />     <link href="StyleSheet/MainStylesheet.css" rel="stylesheet" type="text/css" />     <link href="App_Themes/ForestBlack/TabStrip.ForestBlack.css" rel="stylesheet" type="text/css" />     <link href="App_Themes/CustomTabStripOffice2007/TabStrip.CustomTabStripOffice2007.css"        rel="stylesheet" type="text/css" /> </head> <body style="background-color: Transparent;">     <form id="form1" method="post" runat="server">     <telerik:RadScriptManager ID="RadScriptManager1" runat="server">     </telerik:RadScriptManager>     <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">         <AjaxSettings>             <telerik:AjaxSetting AjaxControlID="ListViewPanel1">                 <UpdatedControls>                     <telerik:AjaxUpdatedControl ControlID="ListViewPanel1" LoadingPanelID="RadAjaxLoadingPanel1" />                 </UpdatedControls>             </telerik:AjaxSetting>         </AjaxSettings>     </telerik:RadAjaxManager>     <%--<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel2" runat="server" MinDisplayTime="0" />--%>     <%-- <asp:UpdatePanel ID="UpdatePanel1" runat="server">     </asp:UpdatePanel>--%>     <telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" Skin="Black" EnableRoundedCorners="true" />     <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" Height="100%" Width="100%"        HorizontalAlign="NotSet" LoadingPanelID="RadAjaxLoadingPanel1">         <div class="MainContent">             <%-- <div id="ContactHeaderImage">                           <div id="ContactHeaderImageMiddle">                 <asp:Label ID="lblContactHeader" runat="server" Text="Contact" CssClass="cssContentHeader"></asp:Label>             </div>             <div id="ContactHeaderImageSearch">                               </div>         </div>--%>             <div id="Contact_ListsMain">                 <fieldset class="flsContactListAll" style="float: left; width: 980px; min-height: 60px;                     padding-bottom: 0px; padding-left: 7px; border: 0px;">                     <telerik:RadTabStrip ID="RadTabStripContactList" runat="server" SelectedIndex="13"                        Skin="CustomTabStripOffice2007" EnableEmbeddedSkins="False" Width="980px" Font-Size="10pt"                        OnTabClick="RadTabStripContactList_TabClick">                         <Tabs>                             <telerik:RadTab runat="server" Text="ALL" Width="65.3px" Selected="True">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="A-B" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="C-D" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="E-F" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="G-H" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="I-J" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="K-L" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="M-N" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="O-P" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="Q-R" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="S-T" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="U-V" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="W-X" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="Y-Z" Width="65.3px">                             </telerik:RadTab>                             <telerik:RadTab runat="server" Text="#" Width="65.3px">                             </telerik:RadTab>                         </Tabs>                     </telerik:RadTabStrip>                     <div class="ContactListView">                         <asp:Panel ID="ListViewPanel1" runat="server">                             <telerik:RadListView ID="rlstvContactSummary" runat="server" ItemPlaceholderID="ListViewContainer"                                AllowPaging="True" PageSize="9" Skin="Black" OnSelectedIndexChanged="rlstvContactSummary_SelectedIndexChanged"                                DataKeyNames="Contact_ID">                                 <LayoutTemplate>                                     <asp:Panel ID="ListViewContainer" runat="server" />                                     <table cellpadding="0" cellspacing="0" width="980px;" style="float: left; margin-left: -1px;                                         margin-top: 8px; background-color: #FFFFFF;">                                         <tr>                                             <td>                                                 <telerik:RadDataPager ID="rdpContactSummary" runat="server" PagedControlID="rlstvContactSummary"                                                    PageSize="9" Skin="Black" Width="979px" CssClass="rdpContactSummary">                                                     <Fields>                                                         <telerik:RadDataPagerButtonField FieldType="FirstPrev" />                                                         <telerik:RadDataPagerButtonField FieldType="Numeric" />                                                         <telerik:RadDataPagerButtonField FieldType="NextLast" />                                                         <telerik:RadDataPagerGoToPageField CurrentPageText="<%$ Resources:LanguageResource, rPage%>"                                                             TotalPageText="<%$ Resources:LanguageResource, rOf%>" SubmitButtonText="<%$ Resources:LanguageResource, rGo%>"                                                             TextBoxWidth="15" />                                                         <telerik:RadDataPagerTemplatePageField>                                                             <PagerTemplate>                                                                 <asp:ImageButton ID="ContactAdd" runat="server" Height="22px" Width="22px" ImageUrl="~/Images/PeopleAddBtn.png" />                                                                   <asp:ImageButton ID="ContactDelete" runat="server" Width="22px" Height="22px"                                                                    ImageUrl="~/Images/PeopleDeleteBtn.png" />                                                             </PagerTemplate>                                                         </telerik:RadDataPagerTemplatePageField>                                                     </Fields>                                                 </telerik:RadDataPager>                                             </td>                                         </tr>                                     </table>                                 </LayoutTemplate>                                 <ItemTemplate>                                     <fieldset class="flsContactList">                                         <div class="ContactListItem">                                             <div class="ContactListPhoto" style="width: 50px; height: 50px; float: left;">                                                 <%--<telerik:RadBinaryImage runat="server" ID="RadBinaryImage1" DataValue='<%#Eval("[Contact_Image]") %>'                                         AutoAdjustImageControlSize="false" Width="50px" Height="50px" ToolTip='<%#Eval("[Contact_Image]", "Photo of {0}") %>'                                         AlternateText='<%#Eval("Contact_Image", "Photo of {0}") %>' />--%>                                                 <img alt="test Image" longdesc="Images/image.png" src="Images/User.png" style="width: 45px;                                                     height: 45px" />                                             </div>                                             <div class="ContactListData" style="float: left; height: 50px; width: 100px; padding-left: 5px;">                                                 <asp:LinkButton ID="LinkButton1" runat="server" CommandName="Select" CssClass="btnLink">                                                     <%--<label>                                                 </label>--%>                                                     <asp:Label ID="Label1" runat="server" Visible="false" Text='<%# Bind("[Contact_ID]")%>'></asp:Label><%#Eval("[First_Name]")%><br />                                                     <%-- <label>                                                 </label>--%>                                                     <%#Eval("[Address]")%><br />                                                     <%#Eval("[Phone_Number]")%>                                                 </asp:LinkButton>                                             </div>                                             <div class="ContactListChk" style="float: right;">                                                 <asp:CheckBox ID="chkContactList" runat="server" />                                             </div>                                         </div>                                     </fieldset>                                 </ItemTemplate>                             </telerik:RadListView>                         </asp:Panel>                     </div>                 </fieldset>             </div>             <div id="ContactDetails">                 <div id="ContactDetailsTab">                     <fieldset class="flsContactDetails" style="float: left; width: 980px; min-height: 400px;                         margin-left: 3px; padding-left: 7px; padding-top: 5px; padding-bottom: 5px; border: 0px;">                         <telerik:RadTabStrip ID="RadTabStrip1" runat="server" MultiPageID="RadMultiPage1"                            UnSelectChildren="True" Skin="CustomTabStripOffice2007" EnableEmbeddedSkins="false"                            ClickSelectedTab="True" AutoPostBack="True" SelectedIndex="0" Font-Size="10pt"                            Width="980px">                             <Tabs>                                 <telerik:RadTab runat="server" Text="<%$ Resources:LanguageResource, rDetails%>"                                     Width="120px" PageViewID="RadPageView1" Selected="True">                                 </telerik:RadTab>                                 <telerik:RadTab runat="server" Text="<%$ Resources:LanguageResource, rSecurity%>"                                     Width="120px" PageViewID="RadPageView2">                                 </telerik:RadTab>                                 <telerik:RadTab runat="server" Text="<%$ Resources:LanguageResource, rUsage%>" Width="120px"                                     PageViewID="RadPageView3">                                 </telerik:RadTab>                             </Tabs>                         </telerik:RadTabStrip>                         <telerik:RadMultiPage ID="RadMultiPage1" CssClass="rpvContactDetails" runat="server"                            SelectedIndex="0" Width="980px" Height="100%">                             <telerik:RadPageView ID="RadPageView1" runat="server">                                 <%--<asp:Button ID="btnEdit" runat="server" Text="Edit" CssClass="btnEdit" SkinID="Black"                                 OnClick="btnEdit_Click" Height="22px" />--%>                                 <div id="ContactDetailsData">                                     <fieldset class="fsContactSubDetails">                                         <div style="float: right; padding-right: 30px;">                                             <asp:Button ID="btnEdit" runat="server" Text="Edit" CssClass="cssButton_Black" OnClick="btnEdit_Click"                                                Height="22px" />                                         </div>                                         <div id="ContactMasterInfo">                                             <div id="ContactMasterInfoLeft" style="width: 475px; float: left">                                                 <div id="Image" style="width: 60px; height: 60px; float: left">                                                     <asp:Image ID="imgContactDetails" runat="server" ImageUrl="Images/User.png" Width="50px"                                                        Height="50px" />                                                     <%--<telerik:RadListView ID="rdContactImage" runat="server" Width="50px" Height="50px">                                                     <itemtemplate>                                                         <telerik:RadBinaryImage runat="server" ID="rdbiContactImage" DataValue='<%#Eval("[Contact_Image]") %>'                                                             AutoAdjustImageControlSize="false" Width="50px" Height="50px" ToolTip='<%#Eval("[Contact_Image]", "Photo of {0}") %>'                                                             AlternateText='<%#Eval("Contact_Image", "Photo of {0}") %>' />                                                     </itemtemplate>                                                 </telerik:RadListView>--%>                                                 </div>                                                 <ul>                                                     <li><strong>                                                         <asp:Label ID="lblFirstName" runat="server"></asp:Label>                                                         <asp:Label ID="lblLastName" runat="server"></asp:Label>                                                     </strong></li>                                                     <li>                                                         <asp:Label ID="lblCompanyName" runat="server"></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblJobTitle" runat="server"></asp:Label>                                                     </li>                                                 </ul>                                             </div>                                             <div id="ContactMasterInfoRight" style="width: 475px; float: left">                                                 <ul>                                                     <li>                                                         <asp:Label ID="lblTitleUserID" runat="server" CssClass="cssLabelTitle" Text="User ID: "></asp:Label>                                                         <asp:Label ID="lblUserID" runat="server"></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblTitleUserType" runat="server" CssClass="cssLabelTitle" Text="User Type: "></asp:Label>                                                         <asp:Label ID="lblUserType" runat="server"></asp:Label>                                                     </li>                                                 </ul>                                             </div>                                         </div>                                     </fieldset>                                     <fieldset class="fsContactSubDetails">                                         <div id="ContactPersonalsInfo" style="width: 950px; float: left">                                             <div id="ContactPersonalsInfoLeft" style="width: 475px; float: left;">                                                 <ul>                                                     <li>                                                         <asp:Label ID="lblTitleJobTitle" runat="server" CssClass="cssLabelTitle" Text="Job Title: "></asp:Label>                                                         <asp:Label ID="lblJobTitle1" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblTitleAssistant" runat="server" CssClass="cssLabelTitle" Text=" Assistant:"></asp:Label>                                                         <asp:Label ID="lblAssistant" runat="server" Text=""></asp:Label>                                                     </li>                                                 </ul>                                             </div>                                             <div id="ContactPersonalsInfoRight" style="width: 475px; float: left">                                                 <ul>                                                     <li>                                                         <asp:Label ID="lblTitleBirthDay" runat="server" CssClass="cssLabelTitle" Text="Birth Day: "></asp:Label>                                                         <asp:Label ID="lblBirthDay" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblTitleNickName" runat="server" CssClass="cssLabelTitle" Text="Nick Name: "></asp:Label>                                                         <asp:Label ID="lblNickName" runat="server" Text=""></asp:Label>                                                     </li>                                                 </ul>                                             </div>                                         </div>                                     </fieldset>                                     <fieldset class="fsContactSubDetails">                                         <div id="ContactWebAddressInfo">                                             <div id="ContactWebAddressInfoLeft" style="width: 475px; float: left">                                                 <ul>                                                     <li>                                                         <asp:Label ID="lblTitlePrimaryEmail" runat="server" CssClass="cssLabelTitle" Text="Primary Email: "></asp:Label>                                                         <asp:HyperLink ID="hlPrimaryEmail" runat="server"></asp:HyperLink>                                                         <%--<a id="mailtoPrimaryEmail"  href="mailto:" >                                                 <asp:Label ID="lblPrimaryEmail" runat="server" Text=""></asp:Label>                                             </a>--%>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblTitleBusinessEmail" runat="server" CssClass="cssLabelTitle" Text="Business Email: "></asp:Label>                                                         <asp:HyperLink ID="hlBusinessEmail" runat="server"></asp:HyperLink>                                                         <%--<a id="mailtoBusinessEmail" href="mailto:">                                                 <asp:Label ID="lblBusinessEmail" runat="server" Text=""></asp:Label>                                             </a>--%>                                                     </li>                                                 </ul>                                             </div>                                             <div id="ContactWebAddressInfoRight" style="width: 475px; float: left">                                                 <ul>                                                     <li>                                                         <asp:Label ID="lblTitleWebSite" runat="server" CssClass="cssLabelTitle" Text="Web Site: "></asp:Label>                                                         <%--//<asp:Label ID="lblWebSite" runat="server" Text=""></asp:Label>--%>                                                         <asp:HyperLink ID="hlWebsite" runat="server" Target="_blank"> </asp:HyperLink>                                                     </li>                                                     <li>                                                         <asp:Label ID="Label17" runat="server" Text=""></asp:Label>                                                         <asp:Label ID="Label18" runat="server" Text=""></asp:Label>                                                     </li>                                                 </ul>                                             </div>                                         </div>                                     </fieldset>                                     <fieldset class="fsContactSubDetails">                                         <div id="ContactAddressAndPhonesInfo" style="width: 950px; float: left">                                             <div id="ContactAddressInfo" style="width: 475px; float: left">                                                 <ul>                                                     <asp:Label ID="lblTitleAddress1" runat="server" CssClass="cssLabelTitle" Text="Work: "></asp:Label>                                                     <li>                                                         <asp:Label ID="lblDescription1" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblStreetOne1" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblStreetTwo1" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblCity1" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblPostalCode1" runat="server" Text=""></asp:Label>                                                     </li>                                                 </ul>                                                 <br />                                                 <br />                                                 <ul>                                                     <asp:Label ID="lblTitleAddress2" runat="server" CssClass="cssLabelTitle" Text="Home: "></asp:Label>                                                     <li>                                                         <asp:Label ID="lblDescription2" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblStreetOne2" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblStreetTwo2" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblCity2" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblPostalCode2" runat="server" Text=""></asp:Label>                                                     </li>                                                 </ul>                                             </div>                                             <div id="ContactPhonesInfo" style="width: 475px; float: left">                                                 <ul>                                                     <li>                                                         <asp:Label ID="lblTitleHomePhone" runat="server" CssClass="cssLabelTitle" Text="Home Phone: "></asp:Label>                                                         <asp:Label ID="lblHomePhone" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblTitleWorkPhone" runat="server" CssClass="cssLabelTitle" Text="Work Phone: "></asp:Label>                                                         <asp:Label ID="lblWorkPhone" runat="server" Text=""></asp:Label>                                                     </li>                                                     <li>                                                         <asp:Label ID="lblTitleMobilePhone" runat="server" CssClass="cssLabelTitle" Text="Mobile Phone: "></asp:Label>                                                         <asp:Label ID="lblMobilePhone" runat="server" Text=""></asp:Label>                                                     </li>                                                 </ul>                                             </div>                                         </div>                                     </fieldset>                                 </div>                             </telerik:RadPageView>                             <telerik:RadPageView ID="RadPageView2" runat="server">                             </telerik:RadPageView>                             <telerik:RadPageView ID="RadPageView3" runat="server">                             </telerik:RadPageView>                         </telerik:RadMultiPage>                     </fieldset>                     <%-- <%#Eval("[User_ID]")%>--%>                 </div>             </div>         </div>     </telerik:RadAjaxPanel>     <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Black">     </telerik:RadAjaxLoadingPanel>     </form> </body> </html> Please help me...

