Telerik UI for Winforms

Release History

UI for WinForms R2 2023 (version 2023.2.606)

June 7, 2023

What's new

  • HeatMap: New control.
  • Visual Studio 2022 Dark Theme.
  • Add the WinForms signed assemblies to the official distribution.
  • RadRichTextEditor: Introduce Line Numbering functionality.
  • RadScheduler: New and modern appointment styles - As default.

Demo Application

  • ERP demo uses a new URL for the service now.


  • Introduce OverwritePrompt property.

Installation and general issues

  • Created project with VB project templates doesn't build after subscribing to the CalendarUserControl.Load event.


  • QR version is not encoded properly.


  • Arrow button disappears on RadDropDownList and RadSpinEditor inside TableLayoutPanel when minimizing and restoring to normal state.


  • Typo in class name FitlerViewTextCategoryItemCreatedEventArgs.


  • Missing system buttons when MDI child form is minimized.
  • Minimizing/Restoring a RadForm increases its size in .NET 7.


  • The property builder of the designer will not open in OpenEdge environment.
  • Sorting through the column header in a group scenario is not working properly.
  • GetClipboardContent() method returns null.
  • A NullReferenceException is thrown when attempting to clear the filter of a bound BindingSource on a grid with Excel-Like filtering.
  • NullReferenceException when setting the grid's ReadOnly property with hidden GridViewCheckBoxColumn.


  • Handled invalid /NULL name encoding for Type1 and TrueType fonts.
  • Introduced an option to replace the predefined Standard Fonts.
  • NullReferenceException when clicking on editable PDFs on textboxes.
  • The CurrentPageTextBox does not get the correct theme.
  • An ArgumentOutOfRangeException is thrown when importing documents with no page content.
  • Wrong rendering of glyphs with a specific Type1 font.
  • The position of unsupported annotation is not calculated as expected when its bounding box starts from a position different than 0.
  • Some glyph geometries from Type1 fonts are not rendered correctly.
  • No images are shown when opening a file on computer with processor with more than 10 logical processors.
  • An ArgumentException is thrown when importing .notdef glyph.
  • A mispositioned and missing text content with specific documents.
  • A file shows blank pages with the latest version.
  • Encrypted Hex strings in Bookmark titles are not decrypted on import.


  • System.NullReferenceException when printing after pasting into the document.
  • The ApplicationMenuStyle and ApplicationMenuAnimantionType properties of the ribbon are hidden.
  • InvalidCastException is thrown when importing a document containing multiple unclosed fields.
  • Using keyboard selection over several table rows is inconsistent.
  • Using advanced selection at line-start upwards select the first word on the initial line.
  • Exporting Hyperlink with InlineUIContainer inside it causes StackOverflowException.
  • Expanding the table selection with the keyboard leaves the caret behind the selection's edges.
  • Copying check box content control with non-default checked/unchecked symbols causes them to reset.
  • Annotation markers are not properly deleted when the text ends with at least two zero-width spaces in succession.


  • Cursor is not visible while dragging on .Net 6 platform.


  • IndexOutOfRangeException when the first column is hidden and perform a left-scroll.


  • Font is serialized as null which leads to designer crashing.


  • NodeCheckedChanging/ed should use the Unknown action when invoked programatically.


  • Introduced public API for setting default stream compression when exporting PDF files.
  • Introduced setting in PdfStreamWriter that allows exporting images with no compression.
  • Introduced export for standard fonts with custom encoding.
  • An EndOfStreamException is thrown when importing a document with startxref pointing to the end of the document.
  • ImageUtils: MissingMethodException is thrown when using a bigger than 2.0 ImageSharp version.
  • The CalGray color space properties are not correctly exported in an array.
  • Slow import of documents containing Shadings Pattern and ICCBased ColorSpace.
  • IOException is thrown when an object in the cross-reference stream has a negative offset.
  • Errors are thrown when validating signed PDF files with VeraPdf and other validators.
  • The position of unsupported annotation is not calculated as expected when its bounding box starts from a position different than 0.
  • Spaces are displayed as rectangles for some TrueType fonts.
  • Glyphs are rendered with different font when trying to create Block with ZapfDingbats.
  • Wrongly parsed document content when the indirect object contains more spaces between object number and generation number.
  • Wrong encoding is used when the PDF file contains font with custom encoding.
  • Some operators cannot be correctly parsed which causes incomplete import.
  • Setting a filter on a mask results in an invalid file when exporting.
  • A KeyNotFoundException is thrown when there is a symbolic font with predefined encoding.
  • A KeyNotFoundException exception is thrown when there are missing characters in the document.
  • A KeyNotFoundException exception is thrown with MacintoshNonSymbolic platform type and WinAnsiEncoding.
  • An InvalidCastException is thrown when importing documents where the endobj keyword is not on a new line.
  • Generated PDF files are not PDF/A compliant according to some validation tools.
  • Documents exported with cross-reference stream are invalid.
  • An ArgumentException is thrown when trying to clone a document containing SignatureField.
  • Applying a wrong default image compression filter leads to a broken PDF file.


  • Importing an XLS file causes NullReferenceException due to fill color.
  • Applying text format to a column also sets the format to the next column.
  • Repeating header rows are not imported correctly in some files.
  • An InvalidOperationException is thrown in the ValueContextResolver when importing a document that contains conditional formatting.
  • Sequence contains no matching element exception is thrown in files containing notes or comments.
  • A conditional formatting rule with a custom formula with reference to another sheet is lost when importing a file generated from Microsoft Excel.


  • Introduced support for importing rich text as plain text.


  • HtmlFormatProvider: Introduced support for setting color values using the rgb() function. Available in NET 4.5 and above.
  • Unify the support of CSS shorthand/longhand properties. Available in NET 4.5 and above.
  • HTML files encoded with Little Endian could not be imported correctly. Available in NET 4.5 and above.
  • PdfFormatProvider: The image in the header is not exported to pdf.
  • The forecolor of table cells text is not preserved when exporting to PDF.
  • Table row which has defined only 'val' attribute of the 'trHeight' is imported as row with auto height.
  • Exporting to PDF documents containing empty table rows results in 0 height of the rows.
  • An ArgumentException is thrown due to incorrect measurement of block elements inside TableCell.
  • NullReferenceException when importing a watermark with no opacity.
  • The mail merge does not work if the template contains a Table of Contents.
  • A KeyNotFoundException is thrown when importing an RTF that references a not declared font.
  • The header is not imported when it contains a watermark.
  • Empty table row is exported to PDF with different height.
  • Empty paragraphs at the end of a table cell are ignored on import from RTF.
  • Invalid list layout when converting to PDF and the list includes several pages.

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