Ajax File Upload In Asp.net With The Asyncfileupload Control

29.01.2020
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AsyncFileUpload - AsyncFileUpload is an ASP.NET AJAX Control that allows you asynchronously upload files to server. The file uploading results can be checked both in the server and client sides.AjaxFileUpload- AjaxFileUpload is an ASP.NET Ajax control which enables you to upload multiple files to the server asynchronously. When the control is used with a browser which supports the latest features of HTML5 - such as MicrosoftInternet Explorer 10, Mozilla Firefox 9, or Google Chrome 17 - then the AjaxFileUpload supports displaying file upload progress. The control displays a progress bar as the file is being uploaded.If a browser does not support the HTML5 File API (for example, Internet Explorer 9) then upload progress is not displayed and a throbber image is displayed instead. In other words, a busy wait image is displayed instead of actual progress.The AjaxFileUpload control also supports a drag-and-drop interface. You can add multiple files to the AjaxFileUpload upload queue by dragging the files onto the AjaxFileUpload control on a page. Alternatively, you can select multiple files toupload by using the SHIFT key or CTRL key when selecting files with the file upload dialog.

These features are not supported by older browsers.By taking advantage of the AllowedFileTypes property, you can restrict the types of files which can be uploaded with the AjaxFileUpload control. For example, you can prevent any file except image files (files with the extensions jpeg, png, orgif) from being uploaded. By taking advantage of the MaximumNumberOfFiles property, you can limit the number of files which can be uploaded with the control. For example, you can prevent a user from uploading more than 5 files.

The AjaxFileUpload control buffers the file being uploaded onto your web server's hard drive. This temporaryfolder is located at Path.GetTempPath.When you call the SaveAs method to save the uploaded file to a new location, the AjaxFileUpload controldeletes the temporary file automatically. If you don't call the SaveAs method (for example, you are saving theuploaded file to a database) then you need to call the AjaxFileUploadEventArgs.DeleteTemporaryData methodto delete the temporary file. The AjaxFileUpload control uses an HTTP Handler named AjaxFileUploadHandler.axdThis handler has the type AjaxControlToolkit.AjaxFileUploadHandler.You must add this handler to your Web.Config file in order for the AjaxFileUpload control to work.Here's the Web.Config configuration that you must add.For IIS7.

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Properties. AllowedFileTypes - A comma-separated list of allowed file extensions. The default is an empty string. AutoStartUpload - Whether or not automatically start upload files after drag/drop or select in file dialog. The default is false. ChunkSize - The size of a chunk used by HTML5 to upload large files in bytes.

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The default is 4096. ClearFileListAfterUpload - Whether or not to hide file upload list container after the uploading finished. IsInFileUploadPostBack - This will be true when a postback will be performed from the control. This can be used to avoid execution of unnecessary code during a partial postback. The default is false. MaxFileSize - The maximum size of a file to be uploaded in Kbytes.

Ajax File Upload In Asp.net With The Asyncfileupload Control Panel

A non-positive value means the size is unlimited. The default is 0. MaximumNumberOfFiles - A maximum number of files in an upload queue. The default is 10. Mode - How AjaxFileUpload displays a progress bar.