Hello everyone,

Here are the highlights of the new online resources we published this week from 10 Nov 2025 to 17 Nov 2025:

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/gantt-collapsing-nodes
Summary: Learn how to collapse parent task nodes in Telerik RadGantt for ASP.NET AJAX using the JavaScript client-side API. You’ll see how to collapse all rows on initialization and programmatically toggle a task’s expanded state, so you can start with a compact Gantt and control the hierarchy on demand.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/autocompletebox-html-encoding-items
Summary: Learn how to control HTML encoding in the RadAutoCompleteBox for ASP.NET AJAX. You’ll encode entry/item text (e.g., via HttpUtility.HtmlEncode) to prevent XSS, and use item/token templates to render intended HTML when you need markup in the dropdown or tokens.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/grid-reorder-columns-with-keyboard-shortcut
Summary: This article explains how to implement keyboard-based column reordering in Telerik ASP.NET AJAX RadGrid. You enable client-side reordering, hook a keydown handler to move the focused header left or right via the RadGrid client-side API, and optionally persist the new order by setting the columns’ OrderIndex on the server.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/retrieve-visible-columns-radgrid-aspnet-ajax
Summary: This article shows how to retrieve the currently visible columns in a Telerik RadGrid for ASP.NET AJAX at runtime. It covers server-side enumeration via MasterTableView.RenderColumns (or filtering Columns by Visible and Display) and a client-side approach using masterTableView.get_columns() with column.get_visible()/get_display(), including considerations for columns hidden via the ColumnMenu and built-in utility columns.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/grid-scrolling-with-frozen-columns-with-mousepad
Summary: This article shows how to make two‑finger touchpad (mousepad) scrolling work correctly in the ASP.NET AJAX RadGrid when Frozen Columns are enabled. You’ll capture wheel/touchpad events over the frozen area and forward the delta to the grid’s scrollable container so horizontal and vertical scrolling stay synchronized, with a concise JavaScript example and guidance on wiring it on grid load.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/autocompletebox-disabling-dynamically-added-tokens-server-side
Summary: Learn how to disable dynamically added tokens in the ASP.NET AJAX RadAutoCompleteBox on the server side. You add entries in code-behind and mark them non-removable, then use a TokenTemplate and CSS to render them disabled so users cannot delete or interact with those tokens, while leaving user-added tokens unaffected.

Feel free to check them out and share your thoughts!

The Telerik Team

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Hello everyone,

Here are the highlights of the new online resources we published this week from 05 Nov 2025 to 10 Nov 2025:

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/fix-telerik-ui-aspnet-ajax-no-license-error
Summary: This KB explains that the error 'No license found for Telerik UI for ASP.NET AJAX' occurs when Telerik.Licensing cannot detect a valid Telerik license file or Script key (Evidence attribute), which differs based on whether the project is a Web Application or a Web Site. It provides step-by-step remediation paths for both project types, covering NuGet-based licensing, manual Script key integration, and correct placement of the telerik-license.txt or Evidence attribute. Following the appropriate steps and rebuilding the project resolves the licensing validation failure.

Feel free to check it out and share your thoughts!

The Telerik Team

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Hello everyone,

Here are the highlights of the new online resources we published this week from 29 Oct 2025 to 05 Nov 2025:

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/overview
Summary: Use the SpeechToTextButton control in Telerik UI for ASP.NET AJAX to capture microphone input and insert recognized text into a specified input or textarea using the browser’s Web Speech API. The overview shows how to configure the target element and recognition settings (language/culture, interim/continuous results), lists HTTPS/permission and browser support requirements (e.g., Chrome/Edge), and details the server- and client-side API and events (start, result, end, error) so you can manage the recognition lifecycle in JavaScript.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/appearance
Summary: This article shows you how to style the ASP.NET AJAX SpeechToTextButton using built‑in skins and custom CSS, including setting the Skin property, toggling EnableEmbeddedSkins/EnableEmbeddedBaseStylesheet, and applying a CssClass. It also covers choosing a RenderMode (Classic or Lightweight) and identifying the control’s HTML/CSS hooks so you can create a custom skin and adjust size, colors, and visual states.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/getting-started
Summary: This guide shows you how to add and configure the SpeechToTextButton in Telerik UI for ASP.NET AJAX to capture microphone input and insert recognized text into a target input (e.g., ASP.NET TextBox or RadTextBox). You’ll register the control, add the markup, associate it with the target input, configure recognition language/options, and wire client-side events for start/stop, results, and errors. It also covers browser and security requirements for the Web Speech API (HTTPS origin and microphone permissions) and provides a minimal working example to validate your setup.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/client-side-programming/enums
Summary: This article lists the client-side enums for the ASP.NET AJAX SpeechToTextButton control and explains the meaning of each value and where it’s used in the control’s JavaScript API. Use these enums in your event handlers and custom logic to check recognition state, handle errors and permission changes, and avoid magic strings or numbers. The enums are available on the client side (Telerik.Web.UI) for consistent integration with SpeechToTextButton.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/server-side-programming/enums
Summary: This article documents the server-side enumerations used by the Telerik UI for ASP.NET AJAX SpeechToTextButton. It lists each enum and its members, explains where they apply in the control’s API, and how they affect behavior and appearance so you can set them correctly in markup or code-behind (C#/VB.NET). Use it as a reference when configuring the control via server-side code.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/client-side-programming/events
Summary: Handle the ASP.NET AJAX SpeechToTextButton client-side events in JavaScript to manage recognition lifecycle, receive result notifications, and handle errors. The article shows how to subscribe via the control’s OnClient* properties or programmatically through the client-side object’s add/remove event methods, and details the event arguments you’ll use to access recognition data and status. Use these hooks to capture interim and final transcripts, update UI state, and control when recognition starts, stops, or is canceled from your application code.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/client-side-programming/overview
Summary: Learn how to get the RadSpeechToTextButton client-side instance in ASP.NET AJAX and use its JavaScript API to start/stop speech recognition, handle results and errors, and update input elements. The article summarizes the control’s client-side events, methods, and properties so you can wire up event handlers and control recognition from JavaScript.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/server-side-programming/overview
Summary: Learn how to use the RadSpeechToTextButton server-side in Telerik UI for ASP.NET AJAX: its server-side properties, methods, and events, and how they interact with the ASP.NET Web Forms page lifecycle. Configure the control in code-behind, handle postbacks, and access the recognized text (e.g., via the target input or control state) for validation and processing.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/asyncupload-display-pdf-preview-file-selection
Summary: Learn how to show a client-side PDF preview immediately after file selection in ASP.NET AJAX using RadAsyncUpload, without uploading to the server. You handle OnClientFileSelected, get the selected File from the underlying input, validate it as a PDF, and render it in an iframe/object or RadPdfViewer via URL.createObjectURL or FileReader, with notes on multiple files and revoking object URLs.

Article: https://www.telerik.com/products/aspnet-ajax/documentation/controls/speechtotextbutton/client-side-programming/properties
Summary: This article documents the client-side properties of the Telerik ASP.NET AJAX SpeechToTextButton and shows how to access them through its JavaScript object ($find) using the standard get_/set_ pattern. You will learn how to read and update behavior, state, and configuration at runtime (for example, enable/disable, target control, and recognition state) so you can integrate speech-to-text into your forms without postbacks.

Feel free to check them out and share your thoughts!

The Telerik Team

This sticky thread lists known issues and breaking changes introduced in the UI for ASP.NET AJAX releases.

• Q3 2011 (Version number: 2011.3.1115)
• Q1 2013 (Version number: 2013.1.220)
• Q2 2013 (Version number: 2013.2.611)
• Q2 2013 SP1 (Version number: 2013.2.717)
• Q3 2013 (Version number: 2013.3.1015)
• Q1 2014 (Version number: 2014.1.225)
• Q2 2014 (Version number: 2014.2.618)
• Q3 2014 (Version number: 2014.3.1024)
• Q1 2015 (Version number: 2015.1.225)
• Q2 2015 (Version number 2015.1.623)
  
• Q2 2015 SP1 (Version number: 2015.2.729)
• Q3 2015 SP1 (Version number: 2015.3.1111)
• Q1 2016 (Version number: 2016.1.113)
• Q1 2016 SP1 (Version number: 2016.1.225)
• R2 2016 (Version number: 2016.2.504)
• R2 2016 SP1 (Version number: 2016.2.607)
• R3 2016 (Version number: 2016.3.914)
• R3 2016 SP1 (Version number: 2016.3.1018) 
• R1 2017 (Version number: 2017.1.118)
• R1 2017 SP1 (Version number: 2017.1.228)
• R2 2017 (Version number: 2017.2.503)
• R2 2017 SP2 (Version number: 2017.2.711)
• R3 2017 (Version number: 2017.3.913)
• R1 2018 (Version number: 2018.1.117)
• R2 2018 (Version number: 2018.2.516)
• R2 2018 SP1 (Version number: 2018.2.710)
• R3 2018 (Version number 2018.3.910)
• R1 2019 (Version number: 2019.1.115)
• R3 2019 (Version number: 2019.3.916)
• R1 2020 (Version number: 2020.1.114)
• R3 2020 SP1 (Version number: 2020.3.1021)
• R1 2021 SP1 (Version number: 2021.1.224)
• R2 2021 (Version number: 2021.2.511)
• R2 2021 SP1 (Version number: 2021.2.616)
• R3 2021 (Version number: 2021.3.914)
• R3 2021 SP1 (Version number: 2021.3.1111)
• R2 2022 SP1 (Version number: 2022.2.622)
• R3 2022 (Version number: 2022.3.913)
• R1 2023 (Version number: 2023.1.314)
• 2024 Q1 (Version number: 2024.1.131)
• 2024 Q3 (Version number: 2024.3.805)
• 2024 Q4 (Version number: 2024.4.1113)
• 2024 Q4 (Version number: 2024.4.1114)
• 2025 Q1 (Version number: 2025.1.211)
• 2025 Q2 (Version number: 2025.2.520)
• 2025 Q3 (Version number: 2025.3.825)
  

Q3 2011 (Version number: 2011.3.1115)

Problem: When adding items to OData-enabled controls (RadMenu, RadTreeView, RadListBox, RadComboBox) through design time erroneous markup is applied to the control:

<telerik:RadListBox runat="server" ID="RadListBox1">
    <Items>
    </Items>
    <WebServiceSettings>
        <ODataSettings InitialContainerName="">
        </ODataSettings>
    </WebServiceSettings>
</telerik:RadListBox>

Please note the added ODataSettings section. It will cause JavaScript errors on the page.

When I run my project I'm getting this error

Could not load file or assembly 'Telerik.Web.UI' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

In my web.config I checked that the version in the web.config is the same as the version I'm using in references

<assemblyIdentity name="Telerik.Web.UI" publicKeyToken="121fae78165ba3d4" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2020.2.617.45" newVersion="2020.2.617.45" />

I'm trying hide a couple of columns in a RadGrid. I can do this in RadGrid1_ItemDataBound with the GrdiHeaderItem setting visible = false.

However, the output still uses space for the 2 columns that were hidden at the end of the grid.

Looking at the page source when I run my app there are 2 extra <col /> tags in <colgroup> and the <tfoot> tag has 2 extra <td></td> tags. There is the correct number of <td> tags in each row in <tr> in the table body.

Could this be from css? Is there a way in override this in RadGrid1_ItemDataBound manually?

On our side the update to version 2025.4 is failing because of browser inlog issue, see attaches screenshot.

What to do?

Marc

Hey everyone, I'm working on an ASP.NET AJAX project and am having some confusion about handling delta updates within partial postbacks.

Specifically:

• I'm trying to update just a small part of a control using delta logic, but the entire control seems to refresh instead.
• I'm not sure if I'm missing a required setting on the UpdatePanel or if delta updates require a different approach in Telerik controls.
• If anyone has best practices, examples, or even "don't do this" warnings, I would seriously appreciate the help.

I am waiting yours valuable replies. Thanks in advance!

Is there any way to get a list of all items from a RadMultiSelect?

I've found the solution of get it from the datasource, but I'm remodeling exiting code that is replacing RadListBoxes and it would be simpler if I could read the items from RadMultiSelect.Items.

Bernie

If the user selects the highlighted text individually (by double clicking their mouse and highlighting the words) and paste it into an Editor, all is good.

However, if the user triple clicks to highlight the entire sentence and then paste that into an Editor, this is what shows up in the HTML view:

<div>
<div id="ctl00_Main_Content_ctl00_Main_Content_RadMultiPagePanel">
<div id="ctl00_Main_Content_RadMultiPage">
<div id="Main_Content_SummaryPage">
<div>
<div>Please load claims from QNXT Production 09/12/2025 into Test Reports.</div>
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div id="ctl00_Main_Content_ctl00_Main_Content_ddlQuickLinksPanel">
<div id="ctl00_Main_Content_ddlQuickLinks" tabindex="0">&nbsp;</div>
</div>
</div>
</div>
</div>

Using the following client script to change the selected value of the slider. However, it does not seem that the "item" or slider "set_value()" function is doing anything. The selected value nor the position of the of the slider changes on the client.

Thank you in advance for any help resolving this issue.

Client Script:

var dateValue = dayjs(selectedDate).format("M/D/YYYY");
var slider = $find("<%=RadSlider1.ClientID%>");
var items = slider.get_items();
for (var i = 0; i < items.length; i++) {
	 var item = items[i];
	 var sliderDate = item.get_value();
	 if (sliderDate == dateValue) {
		 item.set_value(dateValue);
		slider.set_value(dateValue);
		slider.repaint();
		break;
		}
}

Slider Markup

<telerik:RadSlider ID="RadSlider1" runat="server" Skin="Bootstrap" Width="98%" Height="50" Orientation="Horizontal" CssClass="ItemsSlider" OnClientValueChanged="Slider_ValueChanged" AnimationDuration="400" EnableServerSideRendering="true" TrackPosition="BottomRight" ItemType="Item" ThumbsInteractionMode="Push" DataSourceID="dsWeekDays">
	<ItemBinding TextField="WeekdayName" ValueField="WeekdayDate" ToolTipField="WeekdayDate"  />
</telerik:RadSlider>

<asp:SqlDataSource ID="dsWeekDays" runat="server" ConnectionString="<%$ ConnectionStrings:CHPCOMSDB %>" SelectCommand="SELECT WeekdayDate = FORMAT(Weekdaydate, 'M/d/yyyy'), WeekdayName FROM dbo.fx_getLastFiveWeekdays() ORDER BY WeekdayDate" SelectCommandType="Text"></asp:SqlDataSource>