or
<telerik:RadDatePicker ID="rdpDob" runat="server" AutoPostBack="true" DateInput-EmptyMessage="MaxDate" MinDate="01/01/1000"MaxDate="01/01/3000">rdpDob.SelectedDate

<telerik:RadPane ID="RadPane1" runat="server" Width="14%" Scrolling="Y"> <telerik:RadTreeView ID="RadTreeViewSideNav" runat="server" TabIndex="1" AccessKey="T" AllowNodeEditing="false" ShowLineImages="false" OnClientContextMenuItemClicked="RadTreeViewSideNav_ClientContextMenuItemClicked" OnClientMouseOut="RadTreeViewSideNav_ClientMouseOut" OnClientMouseOver="RadTreeViewSideNav_ClientMouseOver" OnClientLoad="RadTreeViewSideNav_ClientLoad" OnClientNodeEditing="RadTreeViewSideNav_ClientNodeEditing" OnClientNodeClicking="RadTreeViewSideNav_ClientNodeClicking" OnClientNodeEditStart="RadTreeViewSideNav_ClientNodeEditStart" OnNodeEdit="RadTreeViewSideNav_NodeEdit" OnNodeClick="RadTreeViewSideNav_NodeClick"> <ContextMenus> <telerik:RadTreeViewContextMenu ID="RadTreeViewContextMenuEmpty" runat="server"> <CollapseAnimation Duration="20" Type="OutQuint" /> </telerik:RadTreeViewContextMenu> <telerik:RadTreeViewContextMenu ID="MainContextMenu" runat="server"> <CollapseAnimation Duration="200" Type="OutQuint" /> </telerik:RadTreeViewContextMenu> <telerik:RadTreeViewContextMenu ID="MainContextMenu2" runat="server"> <CollapseAnimation Duration="200" Type="OutQuint" /> </telerik:RadTreeViewContextMenu> <telerik:RadTreeViewContextMenu ID="RadTreeViewContextMenuContact" runat="server"> <CollapseAnimation Duration="200" Type="OutQuint" /> </telerik:RadTreeViewContextMenu> <telerik:RadTreeViewContextMenu ID="RadTreeViewContextMenuContact1" runat="server"> <CollapseAnimation Duration="200" Type="OutQuint" /> </telerik:RadTreeViewContextMenu> <telerik:RadTreeViewContextMenu ID="RadTreeViewContextMenuContact2" runat="server"> <CollapseAnimation Duration="200" Type="OutQuint" /> </telerik:RadTreeViewContextMenu> </ContextMenus> <CollapseAnimation Duration="100" Type="OutQuint" /> <ExpandAnimation Duration="100" /> </telerik:RadTreeView> <telerik:RadToolTip ID="tt1" runat="server" Position="BottomRight" Width="170px" Height="20px" Animation="None" Modal="false" ShowCallout="false" AutoCloseDelay="10000"> <span id="mails" class="formlabel"></span> <div id="spanSound"></div> </telerik:RadToolTip> </telerik:RadPane> Uncaught TypeError: Cannot read property 'oldUpdatePanelIDs' of undefinedSys.WebForms.PageRequestManagerParserErrorException: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to ...<omitted>...'. Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:6 Error.createTelerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:6 Sys.WebForms.PageRequestManager._createPageRequestManagerParserErrorTelerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:15 Sys.WebForms.PageRequestManager._parseDeltaTelerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:15 Sys.WebForms.PageRequestManager._onFormSubmitCompletedTelerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:15 (anonymous function)Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:6 (anonymous function)Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:6 Sys.Net.WebRequest.completedTelerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_scm_TSM&compress=1&_TSM_CombinedScripts_=%3b…:6 _onReadyStateChange
<div> <asp:Label ID="Label1" runat="server" Text="Label">Please enter your name:</asp:Label><br /> <br /> <asp:Label ID="Label4" runat="server" Text="Label">name: </asp:Label> <asp:TextBox ID="txtName" runat="server"></asp:TextBox> <br /> <br /> <asp:Label ID="Label2" runat="server" Text="Label"> Please enter your last name:</asp:Label><br /> <br /> <asp:Label ID="Label3" runat="server" Text="Label">lastname:</asp:Label> <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox> <br /> <br /> <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /> </div>