Questions on UI for ASP.NET AJAX Forum

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Latest Online Resources about UI for ASP.NET AJAX

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

General Discussions

updated question on 05 Nov 2025

44 answers

9.1K+ views

Known Issues and Important Changes

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)

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.

Solution: Remove the ODataSetting section and the issue will vanish. The problem is also fixed in the Q3 SP1 release, version number 2011.3.1305

General Discussions

updated question on 20 Oct 2025

1 answer

784 views

I'm getting an error with Telerik

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

General Discussions

answered on 22 Oct 2021

0 answers

28 views

Telerik UI for ASP.NET AJAX in Jetbrains Rider

I don't see anyone talking about migrating from Visual Studio to Jetbrains Rider using Telerik.

I have a 20+ year project that's had Telerik being used for a long time. When opening the project in Jebrains Rider, there are a lot of referencing issues and a lot of it is messed up, mostly related to telerik. I mainly use the Telerik wizards for Reporting and for the Ajax UI version, which don't exist in Rider. I wanted to see if anyone has any tips or tricks, or if there is talk about creating plugins for telerik on Jetbrains Rider?

General Discussions

asked on 03 Sep 2025

1 answer

17 views

Telerik.Web.UI.OrgChartDrillDownEventArguments.SourceNode.get returns Nothing

I try to follow the example in https://demos.telerik.com/aspnet-ajax/orgchart/examples/applicationscenarios/drilldowntoviewdetails/defaultvb.aspx?show-source=true but if I run the code and click on an icon for drill-down I get the error at the line "If e.SourceNode.ID <> "1" Then":

Telerik.Web.UI.OrgChartDrillDownEventArguments.SourceNode.get returned Nothing.

The code is:

Private Sub RadOrgChart2_DrillDown(sender As Object, e As Telerik.Web.UI.OrgChartDrillDownEventArguments) Handles RadOrgChart2.DrillDown
If e.SourceNode.ID <> "1" Then
Dim item = New OrgChartGroupItem()
e.SourceNode.Renderer.Controls.Remove(e.SourceNode.Nodes.Renderer)
e.SourceNode.GroupItems.Clear()
e.SourceNode.Nodes.Clear()
e.SourceNode.GroupItems.Add(item)
End If
End Sub

Please advise!

Thx
Gerhard

General Discussions

OrgChart

answered on 19 Aug 2025

1 answer

16 views

Width gets reduced during drag and on cancel do not restore original width

Hi Team,

We are using the Telerik RadScheduler control in our ASP.NET Web Application, configured with a Timeline view and vertical resource grouping. Appointments are displayed in the content pane, similar to the example provided in the following link, with the key difference being that resource grouping is set to vertical:

We are encountering a UI issue when a user drags an appointment to the first hour in the timeline view. If the appointment is moved slightly beyond the start of the timeline (into the previous period), it visually shrinks in width. Upon triggering the confirmation dialog and selecting "No", the appointment correctly returns to its original position, but its visual width remains reduced. This is corrected only upon a manual page refresh. Images shown below for reference.

Editor

General Discussions

answered on 01 Aug 2025

1 answer

278 views

'Sys' is undefined error (fiddler 404 on Telerik.Web.UI.WebResource.axd)

We are having an issue deploying to our user acceptance test and production environments, the telerik webresource.axd file is getting a 404 there, causing the infamous 'Sys' is undefined error I presume. The application works fine on the programmers development web server. The developers app pool is set up as Framework 4.0 Integrated pipeline Windows 7, the test and production environments we deploy to are also set up as Framework 4.0 Integrated pipeline, Windows 2008. We have had our server admin verify that the axd handler mappings are enabled. Additionally I have read all the threads concerning this error and have tried everything, to no avail. Pasted below are the system.web and system.webserver sections of our config file, we have included the telerik webresource axd handler, and it is recognized because if we remove it we get a telerik exception to go add it. The crux of the problem appers to be why we are getting a 404 on this axd. The site is accessed via IBM TAM (Tivoli Access Manager) in the deployment environments, if that makes any difference. Our telerik menus remder however they dont fly out due to not having their axd resources, I presume, so it appears like the telerik dll is getting loaded, telerik tags are recognized. We are deploying the telerik dll's in the /bin (not the GAC). Also pated below is the fiddler log of our default.aspx page loading, note the telerik axd file gets 404.

I tried a small experiment, I created a dummy test.axd text file and browset it from my development machine IIS, I got a 404.17 error "The requested content appears to be script and will not be served by the static file handler".

Then I copied the same file to our deployment server site root and browsed it. Instead of getting a 404.17 error I got a flat out 404 error saying that the resource could not be found.

There is definitly a diference in how the developer box and the deployment boxes are configured, does anyone have an idea.

We are desperate, and fully licensed for this product, we have a user community of 80,000 people waiting for us to deploy this release. So far the only thing holding it back is this problem. I would appreciate any help, we've exhausted everything we could find.

General Discussions

updated question on 23 Jul 2025

1 answer

76 views

Could not load file or assembly Telerik.Web.UI

Hi, I recently received a new laptop at work. I was eventually able to compile and run both of my 2 applications in localhost, and deploy one of them to Dev and Prod. However, I am having problems deploying my 2nd application.

Again, it works fine in localhost. When I deploy to the Dev environment, I get the error:

Could not load file or assembly 'Telerik.Web.UI, Version=2018.1.117.45, Culture=neutral, PublicKeyToken=121fae78165ba3d4' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

The version my reference points to is 2018.2.516.45. So I don't know where the 2018.1.117.45 version is coming from, or why it is attempting to load this version.

Yes, I KNOW that this is an old version. If need be, I can probably upgrade to a newer version. But if I can't figure out the version mis-match now, I think I will have the same problem with a newer version.

Any help is appreciated.

Thanks!

Ajax

General Discussions

answered on 13 Jun 2025

1 answer

38 views

Scrolling with nestedViewTemplate

I'm using a Telerik RadGrid with nested grids (using NestedViewTemplate) inside an ASP.NET Web Forms page. I've enabled scrolling with AllowScroll="true" and UseStaticHeaders="true", and set a fixed width for the outer container with horizontal scrolling.

The issue is that when I scroll horizontally to the right and then expand a nested row, the inner RadGrid (in the nested view) does not align properly or its scroll resets to the left. I want both the parent and child grids to stay aligned and scroll consistently, especially when expanding/collapsing rows.

Has anyone faced a similar issue or found a good way to synchronize scrolling between parent and nested grids?

General Discussions

Grid

answered on 13 Jun 2025

2 answers

219 views

What to do about a TKL001 warning?

Hi,

I recently updated to the 2025 version of telerik. I did it through the nuget option. Followed the steps and added the license file to the roaming directory. So far haven't seen any build errors, no watermarks or popups. I assume everything went smoothly. However, I see a warning, "Telerik and Kendo UI Licensing warning TKL001: No Telerik or Kendo UI product references detected in project." It says that one is to update to 1.4.9. I have 2 sites using this:

Front site has only aspnet.ajax.net462 installed and the Licensing version has the most latest at 1.4.6. 1.4.9 is not in the drop
Admin site has aspnet.ajax.net462 installed followed by windows.zip, windows.documents.spreadsheet, windows.documents.spreadsheet.formatprovider.openxml, windows.documents.core, windows.documents.drawingml, windows.documents.spreadsheet, windows.documents.fixed, windows.documents.flow, windows.documents.flow.formatproviders.pdf, and windows.documents.fixed. In this instance I was able to update the licensing version to 1.6.5

In both cases I still see the warning. Is this something I should just ignore?

General Discussions

answered on 16 May 2025