or
							<form id="form1" runat="server">   <script type="text/javascript">   function onNavigate(isMoveNext)   {         var tabs = $find('<%= rtbstMain.ClientID %>');       var totalNumOfTabs = tabs.get_tabs().get_count();       if(totalNumOfTabs > 0) {           var newTabIndex;           var currentTabIndex = tabs.get_selectedIndex();           if(isMoveNext){               if(currentTabIndex + 1 == totalNumOfTabs) {                   newTabIndex = 0;               }               else {                   newTabIndex = currentTabIndex + 1;               }           }           else{               if(currentTabIndex - 1 < 0) {                   newTabIndex=totalNumOfTabs - 1else {                   newTabIndex=currentTabIndex - 1tabs.set_selectedIndex(newTabIndexscript>   <asp:ScriptManager ID="smPageScriptManager" runat="server" />   <telerik:RadTabStrip ID="rtbstMain" runat="server" MultiPageID="RadMultiPage1" SelectedIndex="0">       <Tabs>           <telerik:RadTab runat="server" Text="Root RadTab1" Selected="True">           </telerik:RadTab>           <telerik:RadTab runat="server" Text="Root RadTab2">           </telerik:RadTab>           <telerik:RadTab runat="server" Text="Root RadTab3">           </telerik:RadTab>       </Tabs>   </telerik:RadTabStrip>   <telerik:RadMultiPage ID="RadMultiPage1" runat="server" SelectedIndex="0">       <telerik:RadPageView ID="RadPageView1" runat="server">           RadPageView1</telerik:RadPageView>       <telerik:RadPageView ID="RadPageView2" runat="server">           RadPageView2</telerik:RadPageView>       <telerik:RadPageView ID="RadPageView3" runat="server">           RadPageView3</telerik:RadPageView>   </telerik:RadMultiPage>   <asp:Button ID="Button1" runat="server" Text="Prev" OnClientClick="onNavigate(false); return false;" />   <asp:Button ID="Button2" runat="server" Text="Next" OnClientClick="onNavigate(true); return false;" /></form>
var week = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(dt, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);