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://docs.telerik.com/reporting/interactivity/ai-powered-insights-overview
Summary: AI-powered Insights in Telerik Reporting lets users query and get natural-language summaries of the data currently rendered in a report directly inside the web report viewer. To enable it, configure an LLM provider in your Reporting REST service (OpenAI, Azure OpenAI, or another OpenAI-compatible endpoint), enable the AI Insights UI in the viewer, and optionally customize the system prompt, allowed models, data scope, and token/request limits. You control what report data is sent to the LLM and can restrict PII and usage to meet security and compliance requirements.

Article: https://docs.telerik.com/reporting/interactivity/built-in-client-integration-ai-insights
Summary: Use the AI Insights panel in Telerik Reporting viewers to let users ask questions and generate summaries for the current report via OpenAI or Azure OpenAI, with all LLM requests routed through the Telerik Reporting REST Service. You enable it per viewer (HTML5/MVC/Angular/React/Blazor) and configure the server with the provider, API key, and model/deployment; you can customize prompts, control what report content is sent to the model, and secure access with authentication and CORS.

Article: https://docs.telerik.com/reporting/knowledge-base/combobox-parameter-editor-virtualization
Summary: Learn how to enable virtualization for the ComboBox parameter editor in Telerik Reporting’s HTML5/Web Report Viewer to handle large parameter value lists. You’ll register a custom parameter editor that wraps a Kendo UI ComboBox with virtualization, remote data (server paging/filtering), and a valueMapper so selected values are resolved and preselected correctly. Use this pattern when a report parameter exposes thousands of available values to reduce initial load, memory usage, and network payload.

Article: https://docs.telerik.com/reporting/interactivity/custom-client-integration-ai-insights
Summary: Implement AI insights in Telerik Reporting by adding a custom interactive action to report items and handling it in the HTML5 Report Viewer. You pass the relevant report context (fields/parameters) to the client, call a server endpoint that proxies OpenAI/Azure OpenAI, and render the response in the viewer while keeping API keys and validation on the server.

Article: https://docs.telerik.com/reporting/interactivity/customizing-ai-powered-insights
Summary: Configure AI-powered insights in Telerik Reporting by defining system and user prompt templates, selecting the report/data scope included in the prompt, and wiring providers such as OpenAI or Azure OpenAI with model, temperature, and token settings. The article shows how to enable the feature in the Report Viewer/REST service, restrict and transform the data that leaves your app, and handle request/response events to validate, redact, log, or cancel AI calls.

Article: https://docs.telerik.com/reporting/licensing/license-troubleshoot
Summary: This article helps you troubleshoot Telerik Reporting licensing issues such as trial watermarks, “Invalid license” errors, and CI/build server failures. You’ll verify that your project references commercial (non-trial) assemblies with matching versions, clean bin/obj, and for .NET Framework ensure a valid Embedded Resource license.licx and LC.exe on build agents; for .NET (Core/5+), remove license.licx and rebuild. It also covers upgrades and removing stale GAC or trial assembly references that trigger trial behavior.

Article: https://docs.telerik.com/reporting/knowledge-base/removing-save-as-option-report-designer
Summary: Learn how to remove or disable the Save As command in Telerik Reporting’s Web Report Designer: hide the Save As button in the client configuration and enforce the restriction server-side by rejecting create operations in your custom report storage/service. Use this to prevent users from cloning reports and allow only in-place Save to the existing item.

Article: https://docs.telerik.com/reporting/knowledge-base/rotate-images-picturebox-telerik-reporting
Summary: Learn how to rotate images in a Telerik Reporting PictureBox when rotation isn’t supported natively. You’ll add a C# user function that uses System.Drawing to rotate a byte[]/Image by a given angle, then call it from the PictureBox.Value expression (e.g., with a report parameter for the angle) and adjust Sizing to fit. The article covers handling image formats/transparency and returning the rotated bitmap for all renderers.

Article: https://docs.telerik.com/reporting/embedding-reports/display-reports-in-applications/web-application/html5-report-viewer/using-in-razor-pages-app
Summary: Learn how to add the Telerik Reporting HTML5 Report Viewer to an ASP.NET Core Razor Pages app by hosting the Reporting REST service and wiring up the client viewer. You will install the Telerik.Reporting and Telerik.Reporting.Services.AspNetCore NuGet packages, configure ReportServiceConfiguration and a ReportsController derived from ReportsControllerBase via dependency injection and routing in Program.cs, then include the required jQuery/Kendo and viewer scripts/styles in a .cshtml page and initialize the viewer with a serviceUrl and reportSource. The article also covers resolving reports from a folder (UriReportSourceResolver) and using file-based storage.

Feel free to check them out and share your thoughts!

The Telerik Team

Hello Telerik Reporting Community,

We have released a new version of Telerik Reporting today, 2024 Q1 (18.0.24.130). Please update your existing installation at your earliest convenience.

You can review the Legacy Installer Vulnerability - Telerik Reporting article to learn more details about why we are recommending customers to update.

To get the new version, take the following steps:

1. Go to Downloads | Your Account. 
2. Select Telerik Reporting.
3. Download the msi installer file, run it, and follow the steps to completion.

Notes

As the KB article explains, the issue pertained only to the old installer component, and not Telerik Reporting contained within the installation package. It does not affect any applications you’re using Telerik Reporting with.

If you have a rare situation where you cannot update the PC installed version, there are various ways to keep a project using an older version of reporting even though the PC has a newer version installed.

• NuGet Option: Update your projects to use the Telerik Reporting NuGet packages, instead of local DLLs (see https://docs.telerik.com/reporting/getting-started/installation/installation-approaches#using-nuget-packages).

• Copied Assemblies Option: Copy the older version’s DLLs to the project directory, then update the project references to use the copied assemblies (instead of the assemblies in C:/Program files (x86)/Progress/Telerik Reporting [older version]/)

We highly recommend you open a Technical Support Ticket if you have a complex situation and would like to ask questions before updating the PC’s installed version. You can open a Support Ticket here => https://prgress.co/DevToolsSupport.

Hello,

I understand that the team is working hard to support the Report Designer for .NET 8 projects in Visual Studio 2022.  However, may I know whether the Report Designer for .NET Framework 4.8 projects will be supported in Visual Studio 2026?

Thanks.

Deepak Gupta

Im getting the "single-row subquery returns more than one row" error when using a stored procedure  as a datasource.

This is the beginning of the procedure that I am calling from the report:

create or replace PROCEDURE get_idoc_report (
    pStart_Date IN DATE,
    pEnd_Date IN DATE,
    pPrepMethod IN VARCHAR2,
    pAnalyticalMethod IN VARCHAR2,
    pInstru IN VARCHAR2,
    pMatrix IN VARCHAR2,
    pPrepAnalyst IN VARCHAR2,
    pAnalyticalAnalyst IN VARCHAR2,
    pWO IN NUMBER,
    pWO_ID IN VARCHAR2,
    pAR IN VARCHAR2,
    p_cursor OUT SYS_REFCURSOR
)
IS 
BEGIN
    OPEN p_cursor FOR
        select distinct 
            to_char(sysdate, 'MM/DD/YYYY') as Current_Date,
            to_char(pStart_Date, 'MM/DD/YYYY') as WO_Start, ......

I have run the procedure in SQL Developer using a record to get data from the cursor, and it returns the expected number of data rows. I have used the same query as a Text select datasource query in Telerik and it worked. Any idea why I am getting the "single-row subquery returns more than one row" ? I am thinking Telerik Standalone is not able to access the rows returned from the sys_refcursor output. Any help is appreciated. I have attached the procedure text and a screenshot of the datasource setup.

Using Telerik Report Designer Version 17.1.23.606 and Oracle Database 19C.

I just added a blank report in VS2022, but I don't see a way to add report items like label, images text boxes etc.  How do I design it?  Thanks!

We are experimeting a very slow perfomance when render report to xlsx format from version 17.2.23.1114 using .Net 7, render to pdf is perfect.
With Telerik 15.2.21.915 version report was fast using .net 5 

Test environment (.net 7 under linux container)
- api .net 7
- running in Linux Container. Pod Kubernetes
- nuget Telerik.Reporting (18.0.24.130)
- nuget Telerik.Reporting .OpenXmlRendering3 (18.0.24.130) with DocumentFormat.OpenXML 3.01 -DocumentFormat.OpenXml.Framework 3.0.1
- nuget Telerik.Reporting .WebServiceDataSource (18.0.24.130)
- nuget Telerik.Drawing.Skia (18.0.24.130)
- dockerfile includes next lines:
       RUN apt-get update
       RUN apt-get install -y libfreetype6
       RUN apt-get install -y libfontconfig1

We have this code to generate the report

 var reportSource = new InstanceReportSource { ReportDocument = _report };
 var reportProcessor = new ReportProcessor();
 var renderingResult = reportProcessor.RenderReport(format.ToString().ToUpper(), reportSource, null);
 var telerikReport = new DocumentResult(renderingResult);
 return telerikReport;

When we use format="XLSX" RenderReport is very low, when use PDF in the same report time is perfect.

In last versions of Telerik, 15.2.21.915, perfomance with XLSX was perfect the same API but in .net 5

What can we do?

Hi All,

We are implementing Web Report Designer in our project. There is Telerik Reporting service is running as a separate service (in Azure VM), our server-side project is also running in k8s which communicate to the Reporting service through gRPC. The Reporting service has custom implementation for IReportSourceResolver (for report preview) and IDefinitionStorage (for report design). We store xml content of a report file in the database that is beside of out server-side project. In the middleware of our project, we need to send report xml content. The problem we have is that xml string is too long and has unsupported characters to be used in Uri.

If you set just Telerik report file name (for report parameter in webReportDesigner.html), then it works. See CustomReportDefinitionStorage class in the picture below. That GetAsync() method works only when you send just report file name. But it doesn't work when you send entire report content as a XML string. Is there any solution or workaround to do this with report xml? Is there a way to do with POST query?

Thanks!

I'm running Telerik Reporting 16.2.22.1109 on windows 10 and just got the unexpected error during work:

System.Xml.XmlException: Root element is missing.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
   at System.Xml.XmlReader.MoveToContent()
   at Telerik.Reporting.Serialization.ObjectReader.Deserialize(IResourceHandler handler)
   at Telerik.Reporting.XmlSerialization.XmlSerializerBase.Deserialize(TextReader reader, IResourceHandler resourceHandler)
   at Telerik.ReportDesigner.Packages.ReportDesigner.Serialization.XmlDocDataHandler.DeserializeReport(IDesignerLoaderHost targetHost)
   at Telerik.ReportDesigner.Packages.ReportDesigner.Serialization.ReportDocumentDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)

What caused this and how to fix it?

AD

Hello, I am testing the  reports with Blazor and I need to get the accumulated per page when the list has more than one page, it is a table of amounts.
I want to get the total until the end of the page (which I get with pageExec) but I can't find a way to get the amount accumulated in the previous page to include in the first line of data SUM AND FOLLOW
and previous sum
.
The data source is a JSON.