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)

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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:

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

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" />

 

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!

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?

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?

After updating to the latest version (2025.1.218), I received an error on only one of my pages where I'm using the asp:RequiredFieldValidator.

The error stated that WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'...

Initially, I added the script mapping to the global.asax.cs page, but then discovered I could just disable UnobtrusiveValidation in the web.config.

The error was resolved with each of these solutions, but I wanted to get away from modifying the global.asax page, so I went with the web.config setting.

My questions are what has changed that led to this error, and which method is recommended?  What are the ramifications of simply disabling it in the web.config?

 

We are facing below issue with latest  telerik control please provide help on it, its very urgent


Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=;;System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35:en-US:f319b152-218f-4c14-829d-050a68bb1a61:ea597d4b:b25378d2;Telerik.Web.UI, Version=2015.1.225.45, Culture=neutral, PublicKeyToken=121fae78165ba3d4:en-US:d3cd47d0-4d93-4bad-8b9f-f9fea0aa4c69:16e4e7cd:f7645509:24ee1bba:6d43f6d9:2003d0b8:f46195d3:c


below is our config settings




<?xml version="1.0"?>
<configuration>

<appSettings>

<add key="vs:EnableBrowserLink" value="false"/>
</appSettings>

<connectionStrings>

</connectionStrings>
<!--Start CM Config-->
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_IReleaseNotesService"/>
<!-- Remove if not using Healthwise Integration -->
<binding name="DrugInteractionsSoap" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="6553600" maxBufferPoolSize="524288" maxReceivedMessageSize="6553600" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true">
<readerQuotas maxDepth="32" maxStringContentLength="6553600" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384"/>
<security mode="Transport">
<transport clientCredentialType="None" proxyCredentialType="None" realm=""/>
<message clientCredentialType="UserName" algorithmSuite="Default"/>
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://help.Lumeris.com/Api/v1.0/ReleaseNotes.svc" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IReleaseNotesService" contract="Client.IReleaseNotesService" name="BasicHttpBinding_IReleaseNotesService"/>
<!-- Remove if not using Healthwise Integration -->
<endpoint address="http://dicapi.healthwise.net/DrugInteractions.asmx" binding="basicHttpBinding" bindingConfiguration="DrugInteractionsSoap" contract="HealthwiseService.DrugInteractionsSoap" name="DrugInteractionsSoap"/>
</client>
</system.serviceModel>
<!--End CM Config-->


<!--
For a description of web.config changes see http://go.microsoft.com/fwlink/?LinkId=235367.

The following attributes can be set on the <httpRuntime> tag.
<system.Web>
<httpRuntime targetFramework="4.5" />
</system.Web>
-->
<system.web>
<httpRuntime encoderType="System.Web.Security.AntiXss.AntiXssEncoder" requestValidationMode="2.0" executionTimeout="43200" maxRequestLength="1048576" maxQueryStringLength="9999"/>
<compilation debug="false" targetFramework="4.5.1">
<assemblies>
<add assembly="System.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Speech, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<!--Devexpress-->
<add assembly="Ext.Net, Version=1.0.4093.32349, Culture=neutral, PublicKeyToken=2E12CE3D0176CD87"/>
<!--CM Config-->
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
</assemblies>

</compilation>
<customErrors mode="Off"/>

<authorization>
<deny users="?"/>
</authorization>
<sessionState mode="StateServer" stateConnectionString="tcpip=127.0.0.1:42424" cookieless="false" timeout="240"/>

<pages autoEventWireup="true" enableSessionState="true" enableViewState="true" enableViewStateMac="true" maxPageStateFieldLength="1000" validateRequest="true" controlRenderingCompatibilityVersion="3.5">
<controls>

<add tagPrefix="telerik" namespace="Telerik.Charting" assembly="Telerik.Web.UI"/>
<add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI"/>

<!--End CM Config-->
</controls>
</pages>
<httpHandlers>
<clear/>

<add verb="*" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler, Telerik.Web.UI"/>
<add verb="*" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler,Telerik.Web.UI" validate="false"/>
<add path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" validate="false"/>
<add path="Telerik.Web.UI.WebResource.axd" verb="*" type="Telerik.Web.UI.WebResource, Telerik.Web.UI" validate="false"/>
<add path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler, Telerik.Web.UI" validate="false"/>

</httpHandlers>
<httpModules>
<add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule"/>

</httpModules>

<identity impersonate="false"/>
</system.web>

<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="52428800" maxQueryString="9999"/>
</requestFiltering>
</security>
<validation validateIntegratedModeConfiguration="false"/>
<modules>
<add name="RadUploadModule" preCondition="integratedMode" type="Telerik.Web.UI.RadUploadHttpModule"/>
</modules>
<handlers>
<remove name="WebServiceHandlerFactory-Integrated"/>
<remove name="ScriptHandlerFactory"/>
<remove name="ScriptHandlerFactoryAppServices"/>
<remove name="ScriptResource"/>

<add name="ChartImage.axd_*" path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler, Telerik.Web.UI, Culture=neutral, PublicKeyToken=121fae78165ba3d4" preCondition="integratedMode"/>
<add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"/>


<!--Start CM Config-->
<add name="TelerikWebResource" verb="*" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource, Telerik.Web.UI" preCondition="integratedMode"/>
<add name="TelerikWebDialogHandler" path="Telerik.Web.UI.DialogHandler.aspx" verb="*" type="Telerik.Web.UI.DialogHandler, Telerik.Web.UI" preCondition="integratedMode"/>
<add name="TelerikChartHandler" path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler, Telerik.Web.UI"/>
<add name="TelerikSpellCheckHandler" path="Telerik.Web.UI.SpellCheckHandler.axd" verb="*" type="Telerik.Web.UI.SpellCheckHandler,Telerik.Web.UI"/>
<add name="Telerik_RadUploadProgressHandler_ashx" verb="*" preCondition="integratedMode" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler"/>
<!--End CM Config-->

</handlers>
<defaultDocument>
<files>
<add value="login.aspx"/>
</files>
</defaultDocument>
<httpProtocol>
<customHeaders>
<clear/>
<add name="X-UA-Compatible" value="IE=EmulateIE8"/>
</customHeaders>
</httpProtocol>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="4.0.0.0"/>
</dependentAssembly>
<dependentAssembly>
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="4.0.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>

We have an application that uses RadGrid and one of our clients recently performed a penetration test on our application and identified the hidden input _ClientState as a vulnerability because they were able to trigger a buffer overflow error.

Here is the relevant code from the test where ClientState=AAA repeats ...

Is there a way to prevent this from happening? Perhaps some way to set the max length for this hidden input or some other technique that we can utilize to mitigate this vulnerability?

We are using Telerik RadControls for ASP.NET Ajax.

For reference, there is another thread related to this topic (i.e., ClientState hidden field) where my colleague posted a similar question but received no response - http://www.telerik.com/forums/what-is-clientstate-input-hidden-for

Hello

we have an application that needs to be put behind a reverse proxy for security reasons. The URLs in the app all need to point to the reverse proxy URLs. However, the URLs for web resources and the dynamically generated JavaScript URLs point to the backend server, so a lot of functionality is broken. We have no possibility to modify reverse proxy rules.

Is there any way to modify or rewrite  the dynamically generated URLs and the web resource URLs ? We tried intervening the page rendering, some stuff works, but a lot of other things do not.

Thanks! 

 

I'm experiencing an issue where the page becomes unresponsive for a long time whenever any Telerik control (such as refresh or loader) is triggered. The page keeps loading indefinitely, causing significant delays, and eventually, the page becomes unresponsive.

Additionally, the following error appears in the browser console:

Uncaught Sys.WebForms.PageRequestManagerTimeoutException: Sys.WebForms.PageRequestManagerTimeoutException: The server request timed out.
at Error.create (https://test.plc.com/GS/Telerik.Web.UI.WebResource.axd?...:6:2736)
at Sys.WebForms.PageRequestManager._createPageRequestManagerTimeoutError (https://wpinhouse.knpc.com/GPCS/Telerik.Web.UI.WebResource.axd?...:15:11219)
at Sys.WebForms.PageRequestManager._onFormSubmitCompleted (https://wpinhouse.knpc.com/GPCS/Telerik.Web.UI.WebResource.axd?...:15:11219)

The issue arises when interacting with Telerik controls that trigger a page request, causing the page to hang and ultimately become unresponsive.

 

issue started from Feb 17 2025