Telerik Reporting

Release History

Progress® Telerik® Reporting R2 2021 SP1 (

June 16, 2021

Keep session alive while the viewer is running

  • Added support for keeping the client session alive in WPF, Windows Forms and HTML5-based report viewers.

What's Improved

  • Added Bring To Front / Send To Back context menu options in Web Report Designer's Explorer Tab, with keyboard shortcuts
  • Users that utilize the WinForms ReportViewer do not have access to the state and to the evaluated values of report parameters
  • Users that utilize WPF ReportViewer do not have out-of-the-box access to the parameters' available values
  • Users that utilize WPF ReportViewer do not have out-of-the-box access to the State property of the ReportViewerModel

What's Changed

  • Removed ReportServerLayout and ReportServer options from Blazor Web Report Designer's default .razor view due to incompatibility
  • Report viewers that utilize Telerik Reporting REST service will now keep the client session alive by default


  • "Could not change property 'Name'. Name 'StartPage' already exists." is shown when trying to create second rendering extension with same parameter name of an existing one
  • Drop-down renders incorrect export formats per report until report is not fully loaded

Web Designer

  • Adjacent dynamic groups are not added to the item's group collection
  • Aggregate functions are available for detail values in Table Wizard
  • An error "Value cannot be null. Parameter name: stream" occurs when updating inline CSV or JSON data
  • Creating a new WebService, JSON or SQL data source doesn't add it in the Explorer tree
  • Data source and report section components allow dragging from the Components tab onto the designer surface
  • Dragging a boolean data field from the Explorer tree onto the design surface doesn't set its Value property
  • Graph is not rendered and message is displayed "Grouping expression should not contain aggregate functions." after data source field is moved from Values to Series boxes in the graph wizard
  • JSON data source escapes characters in the source and makes it invalid
  • Rendering setting or parameter cannot be deleted until the report is saved
  • The DataSource's child nodes in the Explorer tree are not draggable
  • The PictureBox item is cropped at design-time if a padding is set
  • Default rendering settings text is visible until report is changed
  • Pop-up windows are not positioned properly


  • The Blazor web report designer displays a redundant horizontal scroll bar


  • The generated DataMatrix barcodes may not be readable by all barcode readers


  • Swiss QR barcode with combined address does not pass validation due to missing empty lines
  • The null values in the Swiss QR BillData class are serialized incorrectly

HTML5 Report Viewer

  • Freezing table colums and rows headers not working in Firefox and Internet Explorer
  • Frozen column/row headers do not freeze properly when the viewer is in the FitPageWidth scale mode

Product Dependencies

Telerik Reporting
- Microsoft .NET Framework 4
- .NET Standard 2.0
- .NET Core 3.1
- .NET 5
- .NET 6 Preview

- Microsoft.AnalysisServices.AdomdClient ( or later)

HTML5 Report Viewer
- Telerik Kendo UI (2015.3.1111 or later)
- jQuery (1.9.1 or higher if required by Kendo)

ASP.NET WebAPI REST Report Service
- Microsoft ASP.NET Web API (4.0.20710.0 or later) - Newtonsoft.Json (9.0.1 or later)

ServiceStack REST Report Service
- ServiceStack (

ASP.NET MVC Extension of the HTML5 Report Viewer
- Microsoft ASP.NET MVC Framework (4.0.20710.0 or later)

WPF Report Viewer for .NET 6
- Telerik UI Controls for WPF (2021.2.615.60) targeting .NET 6 Preview

WPF Report Viewer for .NET 5
- Telerik UI Controls for WPF (2021.2.615.50) targeting .NET 5

WPF Report Viewer for .NET Core
- Telerik UI Controls for WPF (2021.2.615.310) targeting .NET Core 3.1

WPF Report Viewer for .NET Framework
- Telerik UI Controls for WPF (2021.2.615.40)

Silverlight Report Viewer
- Telerik UI Controls for Silverlight (2021.2.615.1050)

Database cache ICache implementation
- Telerik Data Access ORM (2015.1.220.1)

.NET Core Reporting Engine
- SQLitePCLRaw.bundle_green (2.0.1 or later)

Telerik Reporting

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