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    <p>I'm using the uploadify plugin (http://www.uploadify.com/) - as Jeremy said, it's not in javascript - It's not possible. It's in flash. It's very easy to install.</p> <pre><code>$('#file_upload').uploadify({ 'uploader' : '/uploadify/uploadify.swf', 'script' : '/uploadify/uploadify.ashx', 'cancelImg' : '/uploadify/cancel.png', 'folder' : '/uploads', 'auto' : true, 'fileExt': '*.xls;*.xlsx;*.csv', 'buttonText': 'Select your file', 'onError' : function (event,ID,fileObj,errorObj) { alert(errorObj.type + ' Error: ' + errorObj.info); }, 'onComplete' : function(event, ID, fileObj, response, data) { var obj = jQuery.parseJSON(response); if (obj.error != "" &amp; obj.errror != null) { lblTable.html("error : " + obj.error); } else { lblTable.html(obj.table); lblEditData.show(); lblTable.hide(); } } }); </code></pre> <p>And on the uploadify.ashx :</p> <pre><code>public class uploadify : IHttpHandler { public void ProcessRequest(HttpContext context) { System.Web.HttpPostedFile file = context.Request.Files["Filedata"]; //Check extension string extension = ""; try { extension = file.FileName.Split('.')[file.FileName.Split('.').Length - 1]; if (extension != "xls" &amp; extension != "xlsx" &amp; extension != "csv") throw new Exception("Error of the extension"); } catch { context.Response.Write("{\"error\",\"Error with the extension of the file\""); } string linkFile = System.Web.HttpContext.Current.Server.MapPath("~") + "uploads" + "\\" + DateTime.Now.ToString("yyMMddHHmm") + APIReportPro.DocumentPDF.RandomString(4) + "." + extension; file.SaveAs(linkFile); ...etc... </code></pre> <p>This is the nicest solution I found for asp.net</p>
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    1. POFile upload with JQuery and ASP.NET Generic Handler - Is it possible?
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    1. COquick question... Is it possible to add the following to the script's url: `/uploadify/uploadify.ashx?type=create&val1=val1&val2=val2`... dynamically? Otherwise you have race conditions. If val1 and val2 are needed along with the file-stream to be saved to sql... then you wouldn't know if the file uploaded first or if the val1 and val2 got there on time....
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    2. COI'm not sure to understand what you mean... I did not try but guess that you can add param in your get query to /upladify.ashx
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    3. CO@Zitun you can use System.IO.Path.GetExtension to get file extension
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