Download the full SlickUpload package. This package is free, fully functional and contains many example projects with full VB.NET and C# source code, in WebForms, ASP.NET AJAX, ASP.NET MVC and Razor view engines.

SlickUpload is free for personal, nonprofit, educational, and open source use, accompanied by "Powered By SlickUpload" branding. For commercial sites, or to remove the branding, purchase a license.

Download Latest Version: SlickUpload 6.1.7 - 05 January 2012

NOTE: There is currently a bug in the later versions of Chrome which causes the browser to crash after the user selects their files. To fix this issue, you will need to download this file and put it somewhere on your site:
slickupload.js
You will then need to update the SlickUpload section of the web.config to point to this file using the scriptUrl attribute like so: <slickUpload scriptUrl="/scripts/slickupload.js">

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Download SlickUpload Package

Old Version Archive

The last releases of older versions have been archived for legacy purposes:

SlickUpload 5 Archive

» download: SlickUpload 5.5.11 - 15 Febrary 2011
» documentation: SlickUpload 5 Documentation Archive

SlickUpload 4 Archive

» download: SlickUpload 4.3.2 - 26 May 2009
» documentation: SlickUpload 4 Documentation Archive

SlickUpload 3 Archive

» download: SlickUpload 3.6 - 05 November 2007

Version History

Version 6.1.7 - 05 January 2012

Changes:

Added functionality to disable multiple file selection when MaxFiles=1
Fixed issue with SlickUpload controls hosted on multiple UpdatePanels/ModalPopupExtenders simultaneously
Fixed regression in 6.1.5 with upload session serialization/deserialization

Version 6.1.6 - 02 January 2012

Changes:

Added support for https uploads to S3, made https upload the default
Enhanced drop zone manager, fixed bugs with drag+drop in recent versions of Firefox
Added filtering to eliminate folder drops and zero length files
Added file list form items to default AJAX completion body
Fixed regression in 6.1.5 causing infrequent HTML5 progress updates for larger files

Version 6.1.5 - 27 December 2011

Changes:

Enhanced S3 upload error handling
Enhanced support for high latency connections and lag spikes
Made speed and time remaining calculations more accurate
Added filtering for invalid characters in upload file names
Fixed potential issue with multiple css classes
Fixed state issue with uploads that don't use the SlickUpload client controls
Fixed issue with injection on cassini
Fixed issue with ASP.NET inherited configuration clearing defaultProfile

Version 6.1.4 - 21 November 2011

Changes:

Enhanced error handling and cancellation netcode
Increased SessionStateSessionStorageProvider timeout
Fixed serialization issues with DatabaseSessionStorageProviderBase and derived session storage providers
Fixed issue when onFormSubmitted called with no event

Version 6.1.3 - 2 November 2011

Changes:

Fixed regression with upload data passing
Fixed issue with error display in IE

Version 6.1.2 - 27 October 2011

Changes:

Optimized client page load event detection to speed initial SlickUpload control display
Increased internal connection limit for SessionStateSessionStorageProvider
Added S3 error parsing, throwing typed S3Exceptions
Added support for partial page postbacks without a trigger control
Added functionality to prevent file drag/drop on IE to keep the page from navigating
Fixed issue with unskinned FileSelector template
Fixed client netcode timeout issue on high latency connections
Fixed server timeout issue on high latency connections
Fixed issue with S3 bucket names with non-lowercase names

Version 6.1.1 - 29 September 2011

Changes:

Added support for FileNameMethod.GuidWithExtension for the FileUploadStreamProvider
Fixed issue with manually started uploads from <a> tags when AutoUploadOnSubmit=true
Fixed conflict with jQuery unobtrusive validation

Version 6.1 - 26 September 2011

Changes:

Added support for streaming to S3
Enhanced error checking and support
Added support for Firefox 7
Upgraded InProcSessionStorageProvider to use ReaderWriterLockSlim on .NET 3.5+
Fixed sample styling in IE 6
Fixed issue with IE < 9 and Alpha filter disabled (switches to downlevel mode)
Fixed issue with IE < 9 and ATI Alpha filter bug (uses smaller opacity area)
Fixed issue with skinned element dimensions being set by inherited css
Fixed issue with file cancel at a certain point during uploads causing subsequent files to stall
Fixed issue with exception during cleanup
Fixed issue with Firefox 3.6 hanging after uploading extremely small files

Version 6.0.7 - 6 September 2011

Changes:

Added support for passing information through the SlickUpload process
Fixed issue with SlickUpload on a page with a ScriptManager but no UpdatePanel
Fixed issue with Firefox 3.5 being detected as drag-drop capable

Version 6.0.6 - 30 August 2011

Changes:

Added Quickstart samples
Added support for running in an ASP.NET AJAX UpdatePanel with AutoUploadOnSubmit="true"
Added support for Microsoft MVC AJAX and Ajax.BeginForm
Added diagnostic handler for testing
Fixed latency timeout issues
Fixed issue with starting an upload in the file added event
Fixed several styling/rendering issues
Fixed SessionStateSessionStorageProvider serialization issue

Version 6.0.5 - 18 August 2011

Changes:

Added SessionStateSessionStorageProvider for storing upload session information in SessionState
Added AdaptiveSessionStorageProvider as the default session storage provider
Added UploadFile parameter to IUploadStreamProvider.CloseWriteStream [BREAKING CHANGE]
Added handleRequests and scriptUrl attributes to the slickUpload web.config section
Added better exception messages when providers cannot be constructed
Added UploadedFile.FileSelectorId property
Added UploadConnector.CompletionMethod, UploadConnector.CompletionBody, and UploadConnector.CompletionContentType properties to support AJAX completion and response
Enhanced progress handler to return UploadedFile.Data to client
Disabled multiselect for Safari 5.1 Windows to work around Safari bug in that version
Tweaked dragleave detection to better handle movement
Enhanced client Guid generation
Added PercentCompleteText to FileList supported templates
Added set_CompletionBody to allow sending information to an upload completion handler
Fixed ASP.NET AJAX issues in certain circumstances

Version 6.0.4 - 5 August 2011

Changes:

Added the CustomSqlServer sample
Added VarBinary(MAX) support to the SqlClientUploadStreamProvider
Refactored SqlFileStreamUploadStreamProvider into the SqlClientUploadStreamProvider. If you're currently using the SqlFileStream provider, switch to SqlClient and set dataType="FileStream". [BREAKING CHANGE]
Enhanced error detection, particularly during size calculation
Added UploadProgressElement support to FileList display

Version 6.0.3 - 22 July 2011

Changes:

Enhanced CustomFileName sample to use data passed from the page to determine the storage folder
Added support for Android 2.2+
Updated unsupported browser detection
Fixed cancel issue on some browsers
Fixed id search to remove GridView id generation

Version 6.0.2 - 8 July 2011

Changes:

Added the Post Processing sample
Added the Custom UploadStreamProvider sample
Fixed folder selector to hide during upload completion
Fixed element.click() triggering for links in Firefox 5

Version 6.0.1 - 1 July 2011

Changes:

Added the Slick sample
Renamed the Overview sample to Validation sample
Changed kw.UploadConnector.complete() call to set autoCompleteAfterLastFile=true if files are still uploading
Added additional drag over functionality for css classes (kw-dragging, kw-dragover)
Added kw.FileList.getItemElementById() method to get a file list element for a given file id
Fixed file item extension css class to be always lower case
Fixed dll load exception with the SlickUpload .NET 3.5 build on machines where MVC wasn't installed

Version 6.0 - 24 June 2011

Changes:

Multiple file selection and drag/drop in browsers that support HTML5 file API (currently this is supported by recent versions of Chrome, Firefox, and Safari)
Folder selection in browsers that support it (currently this is supported by recent versions of Chrome)
GMail style individual file upload in all browsers
Rich client API for AJAX uploads
Simplified configuration
Added upload profiles to make configuring multiple upload pages easy
Reworked API with 3 integration modes
WebForms controls
ASP.NET MVC helpers
ASP.NET MVC Razor support
jQuery style javascript client API
Optimized MIME parser for less CPU usage with many simultaneous uploads
Client side file size checking and display on all browsers
Rewritten button skinning
Better error handling and diagnostics

Version 5.5.11 - 15 February 2011

Changes:

Fixed issue with AutoPostBackAfterUpload=false and HasPostProcessStep=true
Fixed issue with UploadUrl containing ?, added set_UploadUrl method to allow setting UploadUrl on the fly
Fixed issue with form action not being reset when AutoPostBackAfterUpload=false
Fixed issue in wizard control designer
Fixed issue with IE9 RC and iframe creation

Version 5.5.10 - 28 December 2010

Changes:

Fixed issue with upload parser rejecting valid uploads in certain rare cases

Version 5.5.9 - 01 December 2010

Changes:

Added kw.SlickUpload.get_UploadId() and kw.UploadConnector.get_UploadId() methods

Version 5.5.8 - 08 November 2010

Changes:

Fixed issue with wasCancelled always being false when AutoPostBackAfterUpload=false
Fixed issue with isValidExtension population in OnFileAdding
Fixed issue with removing a file in OnFileAdded
Fixed issue with Ajax.BeginForm

Version 5.5.7 - 25 October 2010

Changes:

Fixed issue with SlickUpload inside iframes
Made UploadStreamProviderBase.CloseOutputStream virtual
Added support for tracking link postback clicks

Version 5.5.6 - 03 September 2010

Changes:

Added support for Ajax.BeginForm
Fixed issue causing multiple UploadProgressDisplay instance error inside UpdatePanel and Panel

Version 5.5.5 - 19 August 2010

Changes:

Removed isComplete parameter from UpdatePostProcessStatus. Setting completion is now done automatically.
Many various and miscellaneous tweaks and fixes

Version 5.5.3 - 13 May 2010

Changes:

Switched Opera to downlevel mode to solve onchange bug in certain layouts
Fixed issue with submitting after submit button has been disabled in Firefox

Version 5.5.2 - 23 April 2010

Changes:

Fixed issue with extra window opening in certain circumstances on IE6/IE7
Fixed issue with submitting after submit button has been disabled
Fixed issue where target iframe could not be removed
Fixed issue with designer and UpdatePanel

Version 5.5.1 - 05 April 2010

Changes:

Added support for custom operations around stream close in an UploadStreamProvider. Inherit from UploadStreamProviderBase. [BREAKING CHANGE]
Removed cursor setting on FileSelector so it can be set using CSS
Added support for cross-domain uploads
Improved and fixed uplevel FileSelector
Fixed issue with ASP.NET AJAX when some controls are in an UpdatePanel, some are outside, and some controls are invisible initially and made visible on a partial postback

Version 5.5 - 25 February 2010

Changes:

Added support for setting progress url
Added support for multiple visible files in the downlevel template
Added FileSelector OnFileAdding event to allow validation to be performed before a file is selected
Improved ASP.NET AJAX support
Improved stability, handled several potential edge case bugs
Removed FileList OnFileAdded and OnFileRemoved events. Use FileSelector events instead. [BREAKING CHANGE]
Removed FileList get_Files method. Use FileSelector get_Files method instead. [BREAKING CHANGE]
Fixed keyboard accessibility on downlevel template

Version 5.4.2 - 25 January 2010

Changes:

Fixed issue with ASP.NET AJAX in certain scenarios

Version 5.4.1 - 12 January 2010

Changes:

Added support for setting MaxFiles in client script
Added support for setting ValidExtensions and InvalidExtensionMessage in client script
Added support for using stored procedures with the SqlStatusManager and SqlUploadStreamProvider
Fixed issue with ScriptManager without UpdatePanel
Fixed issue with older Firefox versions and uplevel skinning
Fixed issue with Server.Transfer between two pages with SlickUpload controls
Fixed issue with IE6 and HTTPS
Removed FileList remove_File() and clear() methods. Use FileSelector methods instead. [BREAKING CHANGE]

Version 5.3.3 - 08 October 2009

Changes:

Fixed blank SlickUpload.axd download issue on certain versions of Safari on Mac

Version 5.3.2 - 07 October 2009

Changes:

Enhanced uplevel skinning functionality
Added hover support for uplevel skinning
Fixed issue with Safari on Mac

Version 5.3.1 - 24 September 2009

Changes:

Added logic to not show progress bar if no files were selected
Added additional escaping for progress JSON
Removed extraneous outline on skin
Fixed issue with OnClientFileComplete
Fixed issue with reading settings on ASP.NET application init on IIS 7
Fixed localization issue with GenerateLocalResource
Fixed duplicate event firing issue with certain builds of IE

Version 5.3 - 11 July 2009

Changes:

Reworked file selection skinning support
Added support for Opera as an uplevel browser
Added support for databinding in file template
Added workarounds for several ASP.NET 1.1 bugs
Fixed remove issue, clear issue
Fixed file selector quirks mode issue
Removed updateDisplay method as new skinning mode handles visibility without it

Version 5.2.8 - 23 June 2009

Changes:

Added updateDisplay method to support initially display:none scenario
Fixed issue with SlickUpload being dynamically added on an async postback

Version 5.2.7 - 19 June 2009

Changes:

Fixed issue with SlickUpload rendering invisible inside UpdatePanel and then becoming visible on an async postback

Version 5.2.6 - 15 June 2009

Changes:

Added UploadedFile.FileSelectorId property
Improved support for SlickUpload control and FileSelector control on the same page

Version 5.2.5 - 11 June 2009

Changes:

Added clustered sample
Added VB versions of ASP.NET AJAX sample and ASP.NET MVC sample
Improved SQL and S3 samples
Fixed status manager serialization issue
Fixed IE7 update panel related issue

Version 5.2.4 - 5 June 2009

Changes:

Added support for the SlickUpload control inside an UpdatePanel
Added support for multiple uploads before postback
Tweaked branding
Enhanced UploadStreamProvider storage

Version 5.2.3 - 1 June 2009

Changes:

Fixed MaxFiles=1 regression and related Firefox remove issue
Fixed IIS 7 integrated mode with simultaneous requests issue

Version 5.2.2 - 1 June 2009

Changes:

Added quick start guide
Updated getting started guide
Improved installer

Version 5.2.1 - 21 May 2009

Changes:

Added auto enctype setting for MVC forms
Fixed designer templates and display
Fixed submit buttons for cancel calls
Fixed issue with simultaneous uploads and location based config
Fixed issue with adding file parts simultaneous with a cancel

Version 5.2 - 11 May 2009

Changes:

Added uplevel FileSelector template to skin file selection
Changed SelectorHtmlTemplate to DownlevelSelectorTemplate and selector HtmlTemplate to DownlevelTemplate
Fixed issue with typing invalid file names in file box in IE

Version 5.1.2 - 27 Apr 2009

Changes:

Fixed custom progress issue

Version 5.1.1 - 24 Apr 2009

Changes:

Added additional support for ASP.NET MVC
Added ASP.NET MVC sample
Added ASP.NET AJAX sample
Added progress templating/file list templating sample
Added modal progress sample
Added localization sample
Fixed UploadConnector/SlickUpload control BeforeUpload event
Fixed seperate progress display issue

Version 5.1 - 13 Apr 2009

Changes:

Added cancel confirmation message on navigate during upload
Added method to access additional controls templated into FileList
Added internationalization and RTL support
Added ProgressInterval property to control progress poll interval
Optimized status manager to remove extraneous writes
Fixed cancel click timing heisenbug w/ IE 8
Fixed IE6 xml issue

Version 5.0.1 - 26 Mar 2009

Changes:

Optimized SqlClient status manager to reduce reads
Tweaked branding to work on https without messages
Fixed submit() bug when called outside of postback and AutoUploadOnPostBack=true
Fixed SqlClient status manager conflict with postprocessing status
Fixed MaxFiles=1 issue on remove

Version 5.0 - 12 Mar 2009

Changes:

Added SlickUpload control, and related controls (FileSelector, FileList, UploadConnector, UploadProgressDisplay)
Added support for custom templating
Added support for additional fields per file
Added support for maximum number of files
Added support for extension validation
Added postprocessing step with progress
Added full client object model with properties and events
Improved stability/cross browser compatibility
Added ASP.NET MVC support
Deprecated UploadManager control

Version 4.3.2 - 21 May 2009

Changes:

Fixed configuration bug with multiple HttpApplication instances

Version 4.3.1 - 26 Mar 2009

Changes:

Removed duplicate script include under certain circumstances
Added logic to only fire UploadComplete when an upload has actually been initiated

Version 4.3 - 27 Jan 2009

Changes:

Added support for files up to 4 GB
Simplified sample config

Version 4.2.2 - 20 Jan 2009

Changes:

Fixed multiple file upload location provider configuration using location based configuration

Version 4.2.1 - 11 Jan 2009

Changes:

Fixed postback control regression from ASP.NET AJAX support

Version 4.2 - 24 Dec 2008

Changes:

Added Amazon S3 samples (.NET 2.0 only)

Version 4.1.1 - 30 Oct 2008

Changes:

Fixed upload failures when an async ASP.NET AJAX postback occurs during an upload
Fixed files not being cleaned up in certain instances when uploads are abruptly terminated
Added UploadInformation property to pass additional information with an upload
Added connectionStringName property to SQL configuration

Version 4.1 - 16 Sep 2008

Changes:

Revamped ASP.NET AJAX support
Added support for running in ASP.NET AJAX 1.0 Extensions pages
Fixed dupe event firing on some samples
Fixed handlers that use session state and Session_Start

Version 4.0.4 - 31 Jul 2008

Changes:

Added support for running in ASP.NET AJAX pages
Fixed iframe url encoding in certain cases

Version 4.0.3 - 14 Jul 2008

Changes:

Fixed IIS7 field loading and injection issue
Fixed handler session state issue

Version 4.0.2 - 02 Jun 2008

Changes:

Added client side progress event
Fixed hang/no cleanup on slow connections

Version 4.0.1 - 01 May 2008

Changes:

Fixed Firefox hang on tiny files

Version 4.0 - 29 Apr 2008

Changes:

Optimized provider/filter management
Added support for location based configuration
Enhanced error handling scenarios and detail
Fixed cancel button during hung uploads
Better back button handling
Added slickupload form handler
Miscellaneous bug fixes and enhancements

Version 3.6 - 05 Nov 2007

Changes:

Optimized AJAX handling
Added SlickUpload_ClearFiles function to clear the files on the UploadManager
Added UploadManager.AutoUploadOnPostBack property to allow custom submission

Version 3.5.6 - 15 Sep 2007

Changes:

Added support for getting the identity value created by a SqlClientUploadStreamProvider
Fixed .NET 1.x bug where invisible controls would still output script
Fixed duplicate ids in drag-drop progress template
Fixed some wrong labels in a couple of samples

Version 3.5.5 - 12 Aug 2007

Changes:

Added support for SlickUpload controls when multiple forms are on the page
Added server side file filtering

Version 3.5.4 - 02 Jul 2007

Changes:

Added support for the SlickUpload controls inside a frameset
Fixed issue when a ProgressDisplay is on a page with no UploadManager

Version 3.5.3 - 01 Jul 2007

Changes:

Fixed UploadedFile.Save bug

Version 3.5.2 - 24 Jun 2007

Changes:

Fixed Firefox css parsing bug

Version 3.5.1 - 12 Jun 2007

Changes:

Optimized SqlClient status manager
Fixed duplicate client ids on UploadManager
Forced percentage display to two decimal places

Version 3.5 - 08 Jun 2007

Changes:

Added full designer support
Added Krystalware.SlickUpload.IsUploadInProcess flag for client code to check
Added ProgressElement and ProgressBarElement controls
Added support for multiple progress displays
Added support for UploadManager control with a null ProgressAreaTemplate
Added support for UploadManager control within DetailView
Added PercentCompleteText status field
Added UploadManager documentation, with supporting articles

Version 3.2.3 - 01 May 2007

Changes:

Added status fields
- suRemainingLengthText
- suTransferredLengthText
- suTimeElapsedText

Version 3.2.2 - 25 Apr 2007

Changes:

Fixed progress bar localization issues
Added UploadManager.UploadHandlerLocation property to specify a custom upload handler page location

Version 3.2.1 - 16 Apr 2007

Changes:

Added the UploadManagerRequiredFileValidator
Fixed the duplicate event wireup in the UploadManagerVB sample
Added support for searching in ~/bin for the SlickUpload license

Version 3.2 - 07 Apr 2007

Changes:

Fixed validation
Fixed request filtering
Misc browser fixes
Hooked all buttons so events fire for additional buttons on page
Added ProgressDisplay control
Tested on IE 6/7, Firefox, Opera, and Safari

Version 3.1 - 18 Mar 2007

This is a SlickUpload 3 revision release, including .NET 1.1 support as well as some minor bug fixes and enhancements. Changes:

Full samples for .NET 2.0 and 1.1, in C# and VB.NET
Fixed file input adding issue on latest versions of Firefox
Fixed file input adding issue on Opera
Automatically creates destination folder, if possible
Added filename parser handling of semicolons
Added .NET 1.1 build
Removed scrolling on UploadManager iframe
Added autosizing on UploadManager iframe
Tested on IE 5/6, FireFox, Opera, and Safari

Version 3.0 - 12 Feb 2007

Changes:

UploadManager control
Web Farm/Web Garden support
Location based config
UploadStreamProvider architecture

Version 2.0 - 14 Aug 2005

Changes:

UploadLocationProvider architecture
New and updated samples
VB samples
Cassini support
VS 2005 WebHost support
ASP.NET 2.0 support

Version 1.0 - 11 Oct 2004

Initial release.