Hello Telerik Support,

we recently upgraded our application from Telerik UI for ASP.NET AJAX 2025 Q2 to Telerik UI for ASP.NET AJAX 2026 Q2.

Since the upgrade, we have encountered an issue with the RadWindow control when it contains a RadAjaxPanel.

The height and width of the RadWindow are calculated incorrectly. As a result, the content inside the RadWindow is either cut off or the window is significantly larger or smaller than expected.

We were able to reproduce the same behavior in the official Telerik demo:

https://demos.telerik.com/aspnet-ajax/window/examples/autosize/defaultcs.aspx

We have attached a screenshot showing the incorrect behavior in the Telerik demo.

Steps to reproduce

1. Open the Telerik RadWindow AutoSize demo.
2. Use a RadAjaxPanel inside the RadWindow.
3. Compare the behavior between Telerik UI for ASP.NET AJAX 2025 Q2 and 2026 Q2.
4. With 2025 Q2, the window size is calculated correctly.
5. With 2026 Q2, the height and/or width is calculated incorrectly.

Expected behavior

The RadWindow should automatically calculate its size based on the actual dimensions of the content inside the window, including the content of the RadAjaxPanel.

Actual behavior

With Telerik UI for ASP.NET AJAX 2026 Q2, the RadWindow calculates an incorrect height and width when a RadAjaxPanel is present.

Could you please let us know:

• Is this a known issue in 2026 Q2?
• Was there a change in the RadWindow or RadAjaxPanel auto-sizing behavior between 2025 Q2 and 2026 Q2?
• Is there a recommended workaround or configuration we can use?
• Will this issue be fixed in an upcoming release?

Since the issue can also be reproduced in the official Telerik demo, we assume that this is related to a change in the Telerik controls rather than our application.

Thank you for your help.

Best regards

After upgrading from 2019 to 2025.4.1210.462, I am experiencing a JavaScript error when my ASP.NET Web Forms application is opened from Encompass Desktop (embedded browser). The same pages work in modern browsers (Chrome/Edge), but fail inside Encompass.

Environment
Product: Telerik UI for ASP.NET AJAX
Version: 2025.4.1210.462
.NET Framework: 4.8
App type: ASP.NET Web Forms
IIS: Integrated pipeline
Host path: /MyService/
Controls used: RadScriptManager, RadAjaxManager, RadGrid, RadComboBox, RadAjaxPanel, etc.
Entry page from Encompass: Validation.aspx (standalone page, not using a master page)
Telerik CDN: Disabled
RadScriptManager: EnableScriptCombine="false"

Error
When opening MyService from Encompass Desktop, users see:

An error has occurred in the script on this page.

Line: 1
Char: 173461
Error: Invalid character
Code: 0
URL: /MyService/ScriptResource.axd?d=...

What we found
When inspecting the script response, we see modern JavaScript syntax that appears incompatible with the Encompass embedded browser (IE-like engine), for example:

_renderActiveItemStyle:function(e){
  var t=this.get_owner().get_id(),
  i=`${t}_ActiveItemStyle`;
  ...
  e=e.replaceAll(";"," !important;");
  ...
}

It looks like ES6 template literals and replaceAll() are causing a parse error in the embedded browser.

Questions
1) Is Q1 2025 officially unsupported in Internet Explorer/embedded WebBrowser-style hosts such as Encompass Desktop?
2) Is the _renderActiveItemStyle function with template literals expected in Q1 2025 RadGrid scripts?
3) Is there any supported configuration to serve IE-compatible JavaScript while staying on Q1 2025?
     e.g. OutputCompression, CDN, RenderMode, legacy script bundle, etc.
4) If not, what is the recommended Telerik version for IE/embedded browser scenarios - is R3 2022 SP1 (2022.3.1109) the last supported release?

After upgrading from 2019 to 2025.4.1210.462, I am experiencing a JavaScript error when my ASP.NET Web Forms application is opened from Encompass Desktop (embedded browser). The same pages work in modern browsers (Chrome/Edge), but fail inside Encompass.

Environment
Product: Telerik UI for ASP.NET AJAX
Version: 2025.4.1210.462
.NET Framework: 4.8
App type: ASP.NET Web Forms
IIS: Integrated pipeline
Host path: /MyService/
Controls used: RadScriptManager, RadAjaxManager, RadGrid, RadComboBox, RadAjaxPanel, etc.
Entry page from Encompass: Validation.aspx (standalone page, not using a master page)
Telerik CDN: Disabled
RadScriptManager: EnableScriptCombine="false"

Error
When opening MyService from Encompass Desktop, users see:

An error has occurred in the script on this page.

Line: 1
Char: 173461
Error: Invalid character
Code: 0
URL: /MyService/ScriptResource.axd?d=...

What we found
When inspecting the script response, we see modern JavaScript syntax that appears incompatible with the Encompass embedded browser (IE-like engine), for example:

_renderActiveItemStyle:function(e){
  var t=this.get_owner().get_id(),
  i=`${t}_ActiveItemStyle`;
  ...
  e=e.replaceAll(";"," !important;");
  ...
}

It looks like ES6 template literals and replaceAll() are causing a parse error in the embedded browser.

Questions
1) Is Q1 2025 officially unsupported in Internet Explorer/embedded WebBrowser-style hosts such as Encompass Desktop?
2) Is the _renderActiveItemStyle function with template literals expected in Q1 2025 RadGrid scripts?
3) Is there any supported configuration to serve IE-compatible JavaScript while staying on Q1 2025?
     e.g. OutputCompression, CDN, RenderMode, legacy script bundle, etc.
4) If not, what is the recommended Telerik version for IE/embedded browser scenarios - is R3 2022 SP1 (2022.3.1109) the last supported release?

After upgrading from 2019 to 2025.4.1210.462, I am experiencing a JavaScript error when my ASP.NET Web Forms application is opened from Encompass Desktop (embedded browser). The same pages work in modern browsers (Chrome/Edge), but fail inside Encompass.

Environment
Product: Telerik UI for ASP.NET AJAX
Version: 2025.4.1210.462
.NET Framework: 4.8
App type: ASP.NET Web Forms
IIS: Integrated pipeline
Host path: /MyService/
Controls used: RadScriptManager, RadAjaxManager, RadGrid, RadComboBox, RadAjaxPanel, etc.
Entry page from Encompass: Validation.aspx (standalone page, not using a master page)
Telerik CDN: Disabled
RadScriptManager: EnableScriptCombine="false"

Error
When opening MyService from Encompass Desktop, users see:

An error has occurred in the script on this page.

Line: 1
Char: 173461
Error: Invalid character
Code: 0
URL: /MyService/ScriptResource.axd?d=...

What we found
When inspecting the script response, we see modern JavaScript syntax that appears incompatible with the Encompass embedded browser (IE-like engine), for example:

_renderActiveItemStyle:function(e){
  var t=this.get_owner().get_id(),
  i=`${t}_ActiveItemStyle`;
  ...
  e=e.replaceAll(";"," !important;");
  ...
}

It looks like ES6 template literals and replaceAll() are causing a parse error in the embedded browser.

Questions
1) Is Q1 2025 officially unsupported in Internet Explorer/embedded WebBrowser-style hosts such as Encompass Desktop?
2) Is the _renderActiveItemStyle function with template literals expected in Q1 2025 RadGrid scripts?
3) Is there any supported configuration to serve IE-compatible JavaScript while staying on Q1 2025?
     e.g. OutputCompression, CDN, RenderMode, legacy script bundle, etc.
4) If not, what is the recommended Telerik version for IE/embedded browser scenarios - is R3 2022 SP1 (2022.3.1109) the last supported release?

Hey all!

I'm currently testing our production system at our lab, version of Telerik UI is 2012.2.607.40.
When trying to upload file using the Telerik.Web.UI.WebResource.axd?type=rau  endpoint, I'm getting a 302 status code redirect to our app's login page.
What is wrong here? 

Thanks all,
john

Hi sir

     I use RadAjaxManager in master page  i call the RadAjaxManager in master.js file. in Grid itemdatabound call the function

 

if (gridid.toString().toLowerCase().indexOf("explorergrid") >= 0) {
    $("#ContentPlaceHolder1_ExplorerGridSelectedIndexHidden").val(index);
    var ajaxManager = $find('ctl00_RadAjaxManager1');
    ajaxManager.ajaxRequestWithTarget('ctl00$ContentPlaceHolder1$explorerGridViewLink', '');
}

 

when click the grid i got the error in png 

 

I realize this isn't a DNN forum, but couldn't find anything there so hoping someone here can answer.

After upgrading to DNN 9.11.3 several modules don't work right because DNN no longer supports Telerik.

I've read somewhere that you can purchase a Telerik license and just update the dlls for it in DNN in order to resolve this issue.

Has anyone else had this experience?

Thanks

I’m working with Telerik RadGrid and need an example where filtering is enabled on the columns and vertical scrolling is also active. Could someone direct me to a demo or sample that demonstrates this setup?

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

 

Hi,

I am new to the Telerik, I have big story to ask, first I installed the Version=2016.1.113.35 on my Local machine, and started using the application everything was working good, before that I had different Version=2015.2.623.45 of Telerik on the same machine on top  of it I installed the current Version=2016.1.113.35. But when I deployed it on the Server, and server has the older version= 2015.2.623.45 that I had on my machine. And on the Server Telerik controls stopped working like RadEditor was completely disabled. 

Then I did some crazy mistake, I tried to manually copy the dlls of the same Version from Server and added them in to References thinking that this will work as backward compatibility would exist. Now it started giving me different Compilation errors. I am little frustrated can somebody please help me in this regards.

 My errors are as below:

<pre>

Unable to resolve type 'Telerik.Web.UI.RadAjaxLoadingPanel, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'

Unable to resolve type 'Telerik.Web.UI.RadTextBox, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'
Unable to resolve type 'Telerik.Web.UI.RadMaskedTextBox, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'
Unable to resolve type 'Telerik.Web.UI.RadAutoCompleteBox, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'
Unable to resolve type 'Telerik.Web.UI.RadAjaxManager, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'

</pre>

And my Web Config is as below any help please?

<PRE>

<remove name="Telerik_Web_UI_SpellCheckHandler_axd" />
<remove name="Telerik_Web_UI_DialogHandler_aspx" />
<remove name="Telerik_RadUploadProgressHandler_ashx" />
<remove name="Telerik_Web_UI_WebResource_axd" /><add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />

</PRE>