Latest online resources for UI for ASP.NET AJAX

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  1. Marin Bratanov
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    Posted 27 Feb 2017 Link to this post

    RadAsyncUpload for ASP.NET AJAX
    Upload Files in Web Farm / Load Balancing
    Some requirements that are commonly overlooked when working with shared resources in a load balanced environment.

    RadClientExportManager for ASP.NET AJAX
    Save Exported Files
    Added example for saving file on server via page methods

    RadEditor for ASP.NET AJAX
    Using the Image and Document managers outside RadEditor
    Updated to work with the latest R1 2017 version of UI for ASP.NET AJAX

    RadProgressBar for ASP.NET AJAX
    Known Issues
    New article that lists known issues and limitations of RadProgressBar

    UI for ASP.NET AJAX
    Telerik Upgrade API Analyzer Tool
    A tool that analyzes your C# code and can show you places in your code affected by changes in the Telerik UI for ASP.NET AJAX versions. Useful for a quick check before you upgrade.
  2. Marin Bratanov
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    Posted 14 Mar 2017 Link to this post

    RadButton for ASP.NET AJAX
    Select Item
    Updated information on how to get and set selected items in RadRadioButtonList

    RadioButtonList Object
    Updated client-side API for RadRadioButtonList

    RadComboBox for ASP.NET AJAX
    Default Item
    How to add a default item in a combo box when load-on-demand is used, so the user can always see and select them.

    RadSearchBox for ASP.NET AJAX
    Autocomplete
    Added link and info how to pass the max results count to the searchbox service so you can return the desired number of items.

    RadSpell for ASP.NET AJAX
    RadSpell Object
    Added info how to use browser dialogs instead of RadWindows for RadSpell. Useful for scenarios where X-FRAME-OPTIONS header prevents pages from loading in an iframe.

    RadWindow for ASP.NET AJAX
    Autosizing Issues
    Added info on small scrollbar issues and how to avoid them.
  3. Marin Bratanov
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    Posted 22 Mar 2017 Link to this post

    RadFilter for ASP.NET AJAX
    Wrong Control is Filtered with Multiple Instances are Present on the Page
    When you have several instances of a user control where a filter is in an INamingContainer, only the first control is filtered unless you pass the UniqueID

    RadGrid for ASP.NET AJAX
    Exporting Overview
    Add information on how to export template columns.

    CheckList Filtering
    Added a pointer at the end on how to implement cascading excel-like filtering

    Batch Editing Configuration
    Added requirement/limitation of the HighlightDeletedRows feature - the first column must be visible.

    RadTreeList for ASP.NET AJAX
    Expand/Collapse Items
    Add example on expanding an item recursively on the server.
  4. Marin Bratanov
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    Posted 28 Mar 2017 Link to this post

    RadGrid for ASP.NET AJAX
    Accessing Cells and Rows
    Added example how to access custom control editors in template columns on the server

    OnBatchEditOpened
    Add example how to access controls in a cell and modify them according to values from other cells

    Batch Editing Overview
    Add information and links on how to utilize the batch edit mode and how to write custom logic with it.

    Batch Editing Client-side API
    Add examples how to access the batch editing API

    RadTreeMap for ASP.NET AJAX
    How to Use Color Ranges
    How to create shades for sibling nodes based on the main node color - the article shows how to create a custom Kendo Theme that overrides the built-in theme so you can set the desired Kendo color range.
  5. Marin Bratanov
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    Posted 18 Apr 2017 Link to this post

    RadListBox for ASP.NET AJAX
    Duplicate Items after Transfer and AJAX Request
    Item gets duplicated after transferring because the ClientState of the ListBox controls is not updated.

    RadWindow for ASP.NET AJAX
    How to Change the Dialog Templates
    Updated templates list with an improvement that will be available as of R2 2017

    Theme Builder for ASP.NET AJAX
    Sass Theme Builder Overview
    Updated the general information about the Theme Builder tool as per its new version.

    Create and Download a Theme
    Updated information and workflow to reflect the new version of the tool.
  6. Marin Bratanov
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    Posted 25 Apr 2017 Link to this post

    RadTileList for ASP.NET AJAX
    Images Stored in a DataBase in RadTileList
    How to show images from a database in a RadTileList

    RadWindow for ASP.NET AJAX
    Common Issues
    Add information and example on how to set and remove a restriction zone dynamically
  7. Marin Bratanov
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    Posted 02 May 2017 Link to this post

    RadDataForm for ASP.NET AJAX
    Manual CRUD Operations
    Added example for custom template classes and how to get values from them.

    RadHtmlChart for ASP.NET AJAX
    RadHtmlChart Cannot be Bound to a Data Source that Has Special Characters in Its Field Names
    The solution is to rename the fields, the possible workarounds were updated: added information on escaping special symbols in field names for client templates and provided example with setting series properties to such field names.

    ClientTemplate Overview
    Add info for the value object for BoxPlot series so you can build your custom tooltip templates.

    RadRotator for ASP.NET AJAX
    Rotator Moves Items Imprecisely when Buttons Clicked Quickly
    When the user bashes the arrow buttons and the rotator items move imprecisely, you can use custom buttons and prevent the clicks.
  8. Marin Bratanov
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    Posted 09 May 2017 Link to this post

    RadGrid for ASP.NET AJAX
    Accessing Cells and Values in Client-Side Code
    Added examples how to get a refernce to the grid row so you can extract data from it client-side.

    Validation
    Added examples how to validate user input with the Batch Edit mode
  9. Marin Bratanov
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    Posted 17 May 2017 Link to this post

    RadAjax for ASP.NET AJAX
    Ajaxify and Update Controls in Master and Content Page
    Add important information on the types of controls that can initiate requests across content pages, master pages and user controls (they must be postback controls, not containers)

    RadGrid for ASP.NET AJAX
    Keyboard Support
    Add information about conflicting event handlers and preventing event propagation.

    RadPanelBar for ASP.NET AJAX
    Templates Overview
    Entire article is updated to reflect the details on how templates operate and how they should be used.
  10. Marin Bratanov
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    Posted 23 May 2017 Link to this post

    RadGrid for ASP.NET AJAX
    Virtualization
    Updated list of limitations of the Virtualization feature with percent height.

    RadScheduler for ASP.NET AJAX
    Show Appointment Info Instead of Edit Form
    How to double click any appointment to capture the event and not show the popup dialog or inline edit form

    RadSearchBox for ASP.NET AJAX
    RadSearchBox Client Object
    Updated API reference to include the getters and setters for the request delay.

    Telerik.Web.UI.RadSearchBox Client-side API Reference
    Updated API reference to include the getters and setters for the request delay.

    Wrong Results at Medium Typing Speed
    New article on wrong suggestions related to delays in typing and requests.

    RadTabStrip for ASP.NET AJAX
    RadTab Client-side Object
    Added information which method to use to select a tab when RenderSelectedPageOnly is set to the multipage.
  11. Marin Bratanov
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    Posted 30 May 2017 Link to this post

    UI for ASP.NET AJAX
    Old Versions Support Policy
    This article explains important information on how bug fixes, enhancements and browser compatibility are updated and applied in the Progress® Telerik® UI for ASP.NET AJAX control suite

    RadCaptcha for ASP.NET AJAX
    Using WebFarm or WebGarden Environment
    Added necessary information on using the same machine key for all servers in the farm.

    RadGrid for ASP.NET AJAX
    Batch Editing Validation
    New example how to use several column values in validation, especially with Template Column
  12. Marin Bratanov
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    Posted 13 Jun 2017 Link to this post

    RadEditor for ASP.NET AJAX
    Error Thrown when in Spell Check mode and Page is Submitted
    RadEditor throws Object doesn't support property or method 'get_commandName' when executing a command while in spell check mode. This can happen if you clean up content in the OnClientSubmit event,

    Export to PDF
    Updated limitations; added example of using automatic page breaks via the Kendo Drawing API.

    RadGrid for ASP.NET AJAX
    How to Remove Detail Tables from Export
    How to prevent extra rows with detail tables from appearing in exported files.
  13. Marin Bratanov
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    Posted 20 Jun 2017 Link to this post

    RadAsyncUpload for ASP.NET AJAX
    Security
    Improved information on setting encryption keys

    RadClientExportManager for ASP.NET AJAX
    Known Limitations
    Added an issue related to exporting RadHtmlCharts in multiple pages

    RadCloudUpload for ASP.NET AJAX
    Security
    Improved information on setting encryption keys

    RadEditor for ASP.NET AJAX
    Security
    Article on ensuring security with RadEditor dialogs

    RadHtmlChart for ASP.NET AJAX
    Series Labels Color is not Transparent
    How to change the series labels so that they have transparent color in case the default does not suit your design needs.

    RadPivotGrid for ASP.NET AJAX
    XLSX and DOCX formats
    Updated limitations to note common performance issues.

    Excel
    Updated limitations to note common performance issues.

    RadSpell for ASP.NET AJAX
    Security
    Article on ensuring security with RadSpell

    RadSpreadsheet for ASP.NET AJAX
    New Code Library project demonstrating how to show Loading panel when saving RadSpreadsheet
    An example demonstrating how to show a LoadingPanel when saving the Spreadsheet.

    UI for ASP.NET AJAX
    Mandatory Additions to the web.config
    Improved information on setting encryption keys
  14. Marin Bratanov
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    Posted 27 Jun 2017 Link to this post

    UI for ASP.NET AJAX
    Cryptographic Weakness
    Important information pertaining to the security of your sites.
  15. Marin Bratanov
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    Posted 12 Jul 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Mandatory Additions to the web.config
    Added information on encryption keys generation.

    RadAsyncUpload for ASP.NET AJAX
    Security
    How to disable the default (built-in) upload handler for the entire application.

    RadCloudUpload for ASP.NET AJAX
    Security
    How to disable the default (built-in) upload handler for the entire application.

     

    RadDataForm for ASP.NET AJAX
    Start in Insert Mode
    How to show the insert mode of a RadDataForm

    Start in Edit Mode
    Start the data form in edit mode

    RadGrid for ASP.NET AJAX
    Batch Editing Overview
    Added information on validation and preventing data loss

    OnUserAction
    Added example on preventing data loss in batch edit mode

    OnCommand
    Added example on preventing data loss in batch edit mode

    Batch Editing Server-side API
    Added information on validation and preventing data loss

    RadPivotGrid for ASP.NET AJAX
    Insert header row to pivot grid excel export
    How to add a custom header to the excel export

  16. Marin Bratanov
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    Posted 18 Jul 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    FIPS Compatibility
    Updated article contents; added information on .NET 3.5 FIPS issues.

    Included Assemblies
    Improved explanations on which assemblies to use for which .NET versions.
  17. Marin Bratanov
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    Posted 01 Aug 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Installing the Telerik Controls from a NuGet Package
    Added info on using NuGet on build machines

    Appearance Issues when Control is Added During AJAX Request
    Added one solution/workaround - to have a control of that type render on the initial load

    RadAsyncUpload for ASP.NET AJAX
    How to Create a Custom Handler for RadAsyncUpload
    Added information on parameters received by the custom handler, improved explanations and overall readability

    RadEditor for ASP.NET AJAX
    Importing from Word document
    Added information on encoding and importing a DOCX string.
  18. Marin Bratanov
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    Posted 15 Aug 2017 Link to this post

    RadAsyncUpload for ASP.NET AJAX
    UploadedFiles.SaveAs Throws FileNotFound Error with Custom Handler
    When using a custom HTTP handler and you save the files in the page and not in the handler, you may get a FileNotFound error for versions prior to Q1 2016 SP1

    RadCloudUpload for ASP.NET AJAX
    Using the built-in Amazon S3 Provider
    Updated the versions of the AWS packages that are used by UI for ASP.NET AJAX

    RadGrid for ASP.NET AJAX
    IgnorePaging not working on DetailTables Excel Export
    How to export all data in declarative detail table hierarchy with XLS format.

    Object reference not set to an instance of an object in Telerik.Web.UI.RadComboBox.OnInit
    A strange and rare error thrown by RadGrid pager - some ideas and potential solutions.

    RadWizard for ASP.NET AJAX
    Validation
    Added information on how validation works with the Previous button
  19. Marin Bratanov
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    Posted 23 Aug 2017 Link to this post

    RadAsyncUpload for ASP.NET AJAX
    Unrestricted File Upload
    Important security information.

    Insecure Direct Object Reference
    Important security information

    How to Create a Custom Handler for RadAsyncUpload
    Added information on how the temporary folder is used.

    RadAutoCompleteBox for ASP.NET AJAX
    Binding to DataTable, DataSet, or DataView
    Improved simple data binding example to fetch data only on callbacks, when the autocomplete actually binds to data. This reduces requests to the data source and improves page performance.

    Binding to Array, or ArrayList
    Improved simple data binding example to fetch data only on callbacks, when the autocomplete actually binds to data. This reduces requests to the data source and improves page performance.

    RadButton for ASP.NET AJAX
    Validation for RadRadioButtonList
    Updated article to show validation on the Client with CustomValidatiors.

    RadMediaPlayer for ASP.NET AJAX
    YouTube Video Only Plays in Full Screen
    If the YouTube video is not visible in the "normal" mode of the media player, this can help you fix it.

    RadMenu for ASP.NET AJAX
    Hide Icon Column in RadMenu
    How to remove the icon column space in RadMenu

    RadScheduler for ASP.NET AJAX
    Custom Advanced Form with required Resources
    A code library describing how to add validators for custom controls, for example the Resources dropdown.

    RadWindow for ASP.NET AJAX
    Pinned RadWindow with Drag Enabled
    How to have a RadWindow that is pinned but also allows the end user to drag it.
  20. Marin Bratanov
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    Posted 29 Aug 2017 Link to this post

    RadGrid for ASP.NET AJAX
    FilterType HeaderContext
    How to get the items checked in a specific filter in the excel-like filtering mode. An example at the end shows how to access the current filter values.

    RadPanelBar for ASP.NET AJAX
    Templates Overview
    Added important information on when to use which templates and issues that may arise if this guidance is not followed.

    RadScriptManager for ASP.NET AJAX
    Combining External Scripts
    Added details on how to combine scripts from several folders
  21. Marin Bratanov
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    Posted 05 Sep 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Could Not Load File or Assembly 'Telerik.Web.UI' After Upgrade
    What to do if you get Operation is not supported HRESULT: 0x80131515 after upgarding Telerik.Web.UI
  22. Marin Bratanov
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    Posted 12 Sep 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Incorrect positioning of controls
    How to avoid or fix positioning problems with Telerik controls (applies mainly to popups and dropdowns)

    RadAsyncUpload for ASP.NET AJAX
    How to Capture File Upload Errors with Custom Handler
    How to get meaningful error messages to the client when uploading files to a custom handler.

    Unrestricted File Upload
    Added information that may remove the need for applying a security patch.

    Insecure Direct Object Reference
    Added information that may remove the need for applying a security patch.

    RadWindow for ASP.NET AJAX
    Can't execute code from a freed script error when closing a RadWindow
    How to avoid the Can't execute code from a freed script error when closing a RadWindow
  23. Marin Bratanov
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    Posted 19 Sep 2017 Link to this post

    RadGrid for ASP.NET AJAX
    How to Access DataItem from the Topmost Grid from UserControl EditForm
    How to traverse the control hierarchy and obtain data from the parent grid from inside its user control edit form

    Virtualization Limitations
    Updated the list of limitations of the Virtualization feature of RadGrid

    Virtualization and Custom Paging
    How to fetch only some of the data for the grid virtualization features so you can improve the server performance.
  24. Marin Bratanov
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    Posted 26 Sep 2017 Link to this post

    RadAsyncUpload for ASP.NET AJAX
    Incorrect or missing file Content-type
    If the file has an unknown file extension, the file content-type is null.

    RadGrid for ASP.NET AJAX
    Auto-Generated Editors
    Change DateTime picker properties from the code-behind for a GridDateTimeColumn must be done via their SharedCalendar and SharedTimeView properties.

    RadHtmlChart for ASP.NET AJAX
    How to Set Dimensions (Width and Height) to RadHtmlChart Tooltips
    How to set dimensions to the tooltips

    Bullet and VerticalBullet chart types
    fixed information on format strings, item labels and orientation

    RadListView for ASP.NET AJAX
    Use Parent Data from Child Control
    How to access data values from the listview item when working with events on its child controls.

    RadMenu for ASP.NET AJAX
    Keyboard Support and Accessibility
    Added information on how tabIndex attributes work so that keyboard support is enabled to facilitate accessibility
  25. Marin Bratanov
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    Posted 04 Oct 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    CDN Fallback to Local Resources
    A drag-and-drop example of implementing a fallback from the Telerik CDN to local resources in case the client does not have a connection to the cloud.

    RadPivotGrid for ASP.NET AJAX
    Load On Demand for RadPivotGrid ToolTips
    How to enable load-on-demand for the pivot grid tooltips.

    RadTabStrip for ASP.NET AJAX
    Show Loading Sign on Page View
    How to show a loading sign while an external page in a RadMultiPage loads.
  26. Marin Bratanov
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    Posted 10 Oct 2017 Link to this post

    RadDatePicker for ASP.NET AJAX
    Min/Max Date validation and comparison between pickers
    How to implement validation for two pickers (start and end) and show realtime messages to the users in case the standard validation messages do not suffice.

    RadEditor for ASP.NET AJAX
    Change Ribbonbar tabs of RadEditor toolbar on mouse hover
    How-to article of how to switch the Ribbonbar tab items on mouse hover.

    RadGantt for ASP.NET AJAX
    Custom Task Tooltip
    This example demonstrates how to show custom tooltips for the tasks.

    RadGrid for ASP.NET AJAX
    Preserve Custom Sorting on Paging, Filtering or Other Rebinding Action
    Since RadGrid rebinds the data on Paging, Filtering, etc. as described in Commands that invoke Rebind Implicitly, custom sorting could be lost. There is a simple yet efficient approach to bind the data by using a condition which checks whether sorting was applied and then does the binding according to the sorting criteria.
  27. Marin Bratanov
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    Posted 25 Oct 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Content Security Policy (CSP) and UI for ASP.NET AJAX Controls
    This article explains how to configure the CSP header/meta tag so that it allows inline scripts and styles that are needed by the MS AJAX framework and by the Telerik controls.

    RadGantt for ASP.NET AJAX
    Create a Hyperlink column
    This example demonstrates how to achieve a hyperlink column in RadGantt.

    RadGrid for ASP.NET AJAX
    How to update batch edit grids from outside button and also save external user input
    How to save more than one batch edit grid with an external button and also handle other user input or common logic.
  28. Marin Bratanov
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    Posted 09 Nov 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Different Render in Design Time and in Browser
    Why the design-time rendering may not match the rendering in the browser and have differences in the size, color and/or font.

    RadAjax for ASP.NET AJAX
    Get more descriptive errors by disabling AJAX
    How to disable AJAX temporarily

    RadEditor for ASP.NET AJAX
    Prevention of XSS attacks through DOM attributes
    How to remove DOM attributes that can contain an XSS payload from the RadEditor content.

    RadFileExplorer for ASP.NET AJAX
    Security
    A new article that shows a sample approach of securing user actions invoked through RadFileExplorer.

    RadGrid for ASP.NET AJAX
    How to change the Print Button Text of the grid
    New KB for changing the Print Button Text of the grid

    RadHtmlChart for ASP.NET AJAX
    Add Gap Between Donut or Pie Chart Segments
    This sample demonstrates one way to add uniform spacing between pie/donut chart segments, even though such a feature is not available in the chart control.

    RadScheduler for ASP.NET AJAX
    Scheduler client PDF export with ClientExportManager
    This example demonstrates how to export the Scheduler to PDF on the client-side by using the ClientExportManager control.
  29. Marin Bratanov
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    5351 posts

    Posted 14 Nov 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Error: Web.config registration missing! The Telerik dialogs require a HttpHandler registration in the web.config file.
    Updated: Added a new scenario with nested web.config files

    RadGrid for ASP.NET AJAX
    RadGrid with Batch Editing and Dynamic Group Aggregates Calculation
    Demonstrates how to update the group totals when Batch cell value is changed.

    RadMaskedTextBox for ASP.NET AJAX
    Paste and Validate or Modify Content
    How to validate and change pasted content before the masked textbox attempts to match it against the provided mask (for example, strip non-numeric characters from a phone number)
  30. Marin Bratanov
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    5351 posts

    Posted 29 Nov 2017 Link to this post

    Progress® Telerik® UI for ASP.NET AJAX
    Register Telerik HTTP handlers in nested web.config
    How to register the Telerik handlers in a web.config that is not in the root level of the site.

    RadAsyncUpload for ASP.NET AJAX
    Change AllowedFileExtensions and Check Uploaded Files
    How to invalidate and remove files that have the wrong extensions after you change the allowed file extensions.

    Dynamically change the PostbackTriggers collection of the AsyncUpload
    Change the PostbackTriggers collection dynamically. For example, when the validation on the server passes, the control that fired the postback should become a PostbackTrigger for the AsyncUpload

    RadDataPager for ASP.NET AJAX
    SEO Paging Overview
    Added information on how SEO paging works, how the URL changes and what requests are invoked.

    Page size is not changed to 10
    A KB explaining a behavior related to changing the default page size with SEO paging

    RadEditor for ASP.NET AJAX
    Pasting Content Overview
    Added information on IE11 limitations in handling pasting.

    RadGrid for ASP.NET AJAX
    Prevent numeric value changing with Batch editing when using keyboard navigation with the arrow keys
    GridNumericColumn generates RadNumericTextBox in Batch editing which may lead to auto incrementing.

    RadGrid appends 1 to the unique names of auto generated columns
    The UniqueNames of the AutoGeneratedColumns may have 1 appended at their end.

    Get file path to the uploaded file using Async Upload inside RadGrid
    Code library demonstrating how to get file path to the uploaded file using Async Upload inside RadGrid.

    RadImageEditor for ASP.NET AJAX
    How to Initially Zoom the Loaded Image to Best Fit
    Zoom the image loaded in RadImageEditor to best fit the editable area of the control. on initial load.

    RadNavigation for ASP.NET AJAX
    NodeDataBound
    Added examples how to access the DataItem of the node.

    RadPivotGrid for ASP.NET AJAX
    Filter List Missing Values With Large Amount of Data
    The possible values in the filter window is limited and do not include (load) the entire list of all items available from the data source.

    RadScheduler for ASP.NET AJAX
    RadSchedulerRecurrenceEditor does not persist the Selected month in YearView
    In YearView of the RecurrenceEditor, when you postback the page, the dropdowns for selecting the month change their value back to the default value (January).

    RadSpreadsheet for ASP.NET AJAX
    Access the Spreadsheet workbook on the server
    How to access the Spreadsheet workbook on the server when pressing the Save button in the Spreadsheet or calling programmatically the .save() client-side method.
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