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 R2 2017 (version 2017.2.503)

Editor
FIXED

    Editor freezes in IE when deleting right most table column

SpreadStreamProcessing
FIXED

    Cell value containing special characters is not escaped when exporting to CSV.

Spreadsheet
FIXED

    Spreadsheet in UpdatePanel throws SCRIPT16389: Unspecified error in Internet Explorer after async postback

ToolTip
FIXED

    Tooltip background is incorrect
    Wrong callout position in Metro skin under Classic RenderMode

ComboBox
FIXED

    Missing indication for loaded items in RadComboBox MoreResultsBox
    Item not selected when text contains new line
    ComboBox with LoadOnDemand causes infinite requests when ( or ) is searched

CloudUpload
FIXED

    Wrong appearance of Lightweight RadCloudUpload file delete button on hover
    Missing icons of Classic RadCloudUpload in Bootstrap, Office2007, Office2010Black, Office2010Blue, Office2010Silver, Outlook, Sunset, Telerik, Vista, Web20, WebBlue and Windows7 skin

Map
FIXED

    Missing icons of RadMap navigator and zoom buttons

Menu
FIXED

    Unexpected multiple child submenu items expanded when ShowToggleHandle = true and ClickToOpen = true
    When a control inside a Template is focused, the focus of the nested control is immediately lost
    Menu is reopening when closed programmatically

Grid
FIXED

    The grid filter icon is smaller when the Bootstrap skin is set
    RadGrid shows the edit fields in a single line in JAWS Form List when EnableAriaSupport = true
    Pager appearance glitches in Lightweight and Classic render modes

Common
NEW

    RequiredCss is not merged to combined styles in case of inherited controls

Window
FIXED

    Non transparent RadWindow loses the defined size when shown with visibility "Collapsed" and then maximized.
    RadWindow throws error when maximized via JS but Behaviors does not contain Resize
    Lightweight alert/confirm keeps showing the default icon when removed or replaced by a custom one
    Lightweight alert/confirm shows wrong icons.
    RadWindowManager templates POST the page when enter is pressed on a focused textbox
    Removing a restriction zone throws an error
    Appearance issues in RadWindow as of R1 2017
    ULs in RadWindow float to the right under Firefox 52+ and Chrome 58+ (affects controls like RadTreeView, RadListBox, RadEditor toolbar, RadPanelBar, RadTabStrip) 

Splitter
FIXED

    Gray background in RadSplitter, RadFileExplorer and RadEditor dialogs with RenderMode Classic, Default and Silk skins
    Missing skin colors in sliding panes as of R1 2017

ProgressBar
FIXED

    ProgressBar does not resolve its skin-specific stylesheet

Button
FIXED

    RadButton as Checkbox/Radio checked backgrounds are misplaced in Classic RenderMode
    SelectedValues, SelectedItems and SelectedIndices properties are not available in the intellinsense in the server code

TileList
FIXED

    Inconsistent colors and background colors of Tiles

OrgChart
FIXED

    Wrong appearance of Classic RadOrgChart in MetroTouch skin

FormDecorator
FIXED

    Appearance issues of decorated asp:DropDownList by RadFormDecorator in Classic Render mode and MetroTouch skin
    Whitespace or broken font icon on radio buttons when RenderMode=Classic and a RadControl with RenderMode=Lightweight is on the page

Slider
FIXED

    Slider drag handle is not available in Metro skin with classic rendering
    RadSlider increase and decrease handles direction is not correct when switching the orientation on the client

SpreadProcessing
NEW

    Introduced support for the TRIM function.
    Introduced support for the CHOOSE function.

FIXED

    Formula values resulting in exponential numbers with very small values are calculated as zero.

Calendar
FIXED

    Visual glitches in the Bootstrap, Metro and Material skins

PdfProcessing
NEW

    Implemented optimizations in PdfStreamWriter cache to reduce memory when writing RadFixedPage instances.
    Introducing AlphaChannel property and alphaChannel constructor parameter in EncodedImageData class allowing to create images with transparency.
    Implemented support for interactive forms and form fields, allowing reading and filling of form fields values.
    Implemented support for Form XObjects, allowing reuse of PDF content.
    Implemented support for validation and creation of a digital signature.

FIXED

    PdfFileSource resources are kept in PdfStreamWriter cache even after the PdfFileSource instance is disposed.

Only for V.I.P