Enjoy components for every need: navigation and layout, data management and visualization, editing, interactivity and more. In our 11 years of aggressive product development including 3 major and up to 6 minor releases per year we have implemented, tested and optimized over 4,000 features in Telerik ASP.NET controls.

Complete Set of Features and Controls
Enjoy components for every need: navigation and layout, data management and visualization, editing, interactivity and more. In our 11 years of aggressive product development including 3 major and up to 6 minor releases per year we have implemented, tested and optimized over 4,000 features in Telerik ASP.NET controls.

Mobile Support and Responsiveness
No need to build a mobile version of your project since the web sites and apps built with Telerik ASP.NET controls work equally well on desktop and mobile devices.

Use the Page Layout Framework to build responsive ASP.NET applications
Leverage the adaptive, fluid, elastic and responsive capabilities featured in most controls to offer user experiences tailored to each end-user's device
Gain productivity since touch events are handled in the same manner as those triggered by a keyboard or a mouse
Get a better user experience with the two mobile skins especially designed for touch devices that come included in the suite

20 Built-In Professional Grade Skins
Give your applications a sleek, professional look by setting a single property. By applying one of the 20 professionally-designed skins that come with Telerik UI for ASP.NET AJAX, including two engineered with mobile devices in mind, you save design and front-end development time. No need to be a CSS wizard to create or customize the Telerik skins with our web-based Visual Style Builder.

Exceptional Performance and User Experience

We constantly optimize the performance of UI for ASP.NET AJAX to meet your end users expectations. This is why the controls:

Produce minimal and clean HTML and CSS
Minimize j@vascript by loading only whats needed
Reduce postbacks for a better user experience
Compress data transferred between browser and server (Pages, j@vascript, ViewState, JSON data, etc.)
Use built-in CDN support and CSS sprites to deliver content faster to end-users (Telerik covers all CDN costs for you)
Minimize memory usage and have robust code, free from memory leaks

UI for ASP.NET AJAX R3 2017 (version 2017.3.913)

September 13, 2017
Common
FIXED

    NullReferenceException in RadScriptManager and RadStyleSheetManager from Telerik.Web.UI.CryptoService.GetService()

Grid
NEW

    Improved Accessibility

PdfProcessing
NEW

    Information about the signing date is added in 'Signature Validation Status' dialog.

FIXED

    Different exceptions can be thrown when creating documents in multiple threads simultaneously.
    A color is not imported correctly when the color component of an RGB color space is outside of allowed ranges.
    UriFormatException is thrown when importing Action without the HTTP prefix.
    InvalidCastException is thrown by PdfFormatProvider when importing CID font widths array containing real width values.
    Field values are not visible in Adobe Reader when "Show border hover color for fields" setting is selected.

SpreadProcessing
NEW

    Exposed WorksheetUIUpdateContextBase.GetDataValidationRuleResult(CellIndex) public method, useful for creating custom data validation layers.
    Added support for the VLOOKUP and HLOOKUP functions.
    Added support for MATCH function.
    Added support for the DAYS function.

FIXED

    Wrong exception messages are constructed sometimes, due to problem in the internal guard methods.
        Guard.ThrowExceptionIfTrue now throws InvalidOperationException with text " should be false.
        Guard.ThrowExceptionIfFalse now throws InvalidOperationException with text " should be true.
    Characters different than digits or letters entered in Formulabar are not visible in Expression_Dark, VisualStudio2013 dark and Green dark themes.
    InvalidOperationException is sometimes thrown when exporting to XLSX format in multi-threaded scenario.

CHANGED

    Updated the default values of first three FormulaSelectionColors to be visible in Expression_Dark, Green and VisualStudio2013 Dark themes.

SpreadStreamProcessing
NEW

    Added IWorkbookExporter.GetSheetInfos() method for accessing the names of the sheets within the workbook.

CHANGED

    Default encoding of CSV documents changed to UTF8 with BOM, so you can easily work with special characters like Umlauts.

WordsProcessing
FIXED

    Getting actual style property value is evaluating Normal style last when a paragraph without explicitly assigned style is in a table.
    RtfFormatProvider: Non-breaking spaces declared with control word are missing after import.

Only for V.I.P