Can we add multiple files using a single ASP.NET FileUpload control

Question

nilesh Patil · Answer

Yes You can Add multiple Files using Ajax File Upload Control refer following link http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/AjaxFileUpload/AjaxFileUpload.aspx

Nattudurai Eswaramurthy · Answer

http://www.dotnetfunda.com/articles/article981-multiple-files-upload-in-aspnet-and-aspnet-with-jquery.aspx

Nattudurai Eswaramurthy · Answer

Step 1: Drag and drop the FileUpload server control from the toolbox. The code behind looks as follows : asp:FileUpload id= FileUpload1 runat= server /> Step 2: Drop a Button control and rename it to Upload asp : Button ID =btnUpload runat =server Text =Upload /> Step 3: Double click the Upload Button to add an event hander to the code behind. C# protected void btnUpload_Click( object sender EventArgs e) { } VB.NET Protected Sub btnUpload_Click( ByVal sender As Object  ByVal e As EventArgs) End Sub Step 4: Add the following code to the event handler C# protected void btnUpload_Click( object sender EventArgs e) { try { if (FileUpload1.HasFile) { FileUpload1.SaveAs(Server.MapPath( MyFiles ) + \ + FileUpload1.FileName); } } catch ( Exception ex) { // Handle your exception here } } VB.NET Protected Sub btnUpload_Click( ByVal sender As Object  ByVal e As EventArgs) Try If FileUpload1.HasFile Then FileUpload1.SaveAs(Server.MapPath(MyFiles) & \ & FileUpload1.FileName) End If Catch ex As Exception ' Handle your exception here End Try End Sub The HasFile property of our FileUpload control helps us to determine if a file has actually been uploaded. We then use the SaveAs method to save the file to disk. That is all you require to implement the FileUpload functionality in your web pages. In order to retrieve the metadata information of the file being uploaded you can drop a Label control on to the form designer and use the PostedFile.FileName and PostedFile.ContentLength on the FileUpload control. This would give you the uploaded file's name and size respectively. Eg: Label1.Text = FileUpload1.PostedFile.FileName; Label1.Text += FileUpload1.PostedFile.ContentLength; Uploading Multiple Files So far so good. Let's extend the above sample to upload multiple files at a time. Follow these steps mentioned below to do so: Step 1: Drag and drop multiple (in our case four) FileUpload controls on to the designer. Step 2: Drop a Button control and rename it to Upload asp : Button ID =btnUpload runat =server Text =Upload /> Step 3: Double click the Upload Button to add an event hander to the code behind. C# protected void btnUpload_Click( object sender EventArgs e) { } VB.NET Protected Sub btnUpload_Click(ByVal sender As Object ByVal e As EventArgs) End Sub Step 4: Import the System.IO namespace. using System.IO; - C# Imports System.IO - VB.NET Step 5: Use the 'HttpFileCollection' class to retrieve all the files that are uploaded. Files are encoded and transmitted in the content body using multipart MIME format with an HTTP Content-Type header. ASP.NET extracts this information from the content body into individual members of an HttpFileCollection. The code would look as follows: C# protected void btnUpload_Click( object sender EventArgs e) { try { // Get the HttpFileCollection HttpFileCollection hfc = Request.Files; for ( int i = 0; i { HttpPostedFile hpf = hfc[i]; if (hpf.ContentLength > 0) { hpf.SaveAs(Server.MapPath( MyFiles ) + \ + Path .GetFileName(hpf.FileName)); } } } catch ( Exception ex) { // Handle your exception here } } VB.NET Protected Sub btnUpload_Click( ByVal sender As Object  ByVal e As EventArgs) Try ' Get the HttpFileCollection Dim hfc As HttpFileCollection = Request.Files For i As Integer = 0 To hfc.Count - 1 Dim hpf As HttpPostedFile = hfc(i) If hpf.ContentLength > 0 Then hpf.SaveAs(Server.MapPath(MyFiles) & \ & Path.GetFileName(hpf.FileName)) End If Next i Catch ex As Exception ' Handle your exception here End Try End Sub The 'HttpPostedFile' class provides methods and properties to access the contents and properties of each file. In our case we use this class to check the length of the file. To retrieve the filename and length of the file uploaded we can use hpf.FileName and hpf.ContentLength respectively. Well that was simple to implement wasn't it! However there are a few points to be kept in mind. Some important points to consider while uploading 1. To save a file to the server the account associated with ASP.NET must have sufficient permissions on the folder where the files are being uploaded. This would usually be the 'ASPNET' account for Windows XP or a similar OS. In Windows Server 2003 the account used is 'NETWORKSERVICE'. So you would be required to explicitly grant write permissions to these accounts on the folder. 2. While uploading the files to a remote server the default ASPNET user account used by ASP.NET does not have network permissions by default. The solution is to either give the account such permissions or use impersonation to have it run under a different account that has the permissions. 3. By default you can upload no more than 4096 KB (4 MB) of data. However there is a workaround for this limitation. You can change the maximum file size by changing the maxRequestLength attribute of the httpRuntime element in the web.config file. You can also increase the ' executionTimeout' . By default it is 110 seconds. I would encourage you to experiment with the other attributes of the httpRuntime element. configuration > system.web > httpRuntime executionTimeout =  200  maxRequestLength =  8192  requestLengthDiskThreshold =  256  useFullyQualifiedRedirectUrl =  false  minFreeThreads =  8  minLocalRequestFreeThreads =  4  appRequestQueueLimit =  5000  enableKernelOutputCache =  true  enableVersionHeader =  true  requireRootedSaveAsPath =  true  enable =  true  shutdownTimeout =  90  delayNotificationTimeout =  5  waitChangeNotification =  0  maxWaitChangeNotification =  0  enableHeaderChecking =  true  sendCacheControlHeader =  true  apartmentThreading =  false  /> system.web > configuration > References There are a number of good resources I referred to for this article. A few of them are: http://www.wrox.com/WileyCDA/Section/id-292160.html http://msdn2.microsoft.com/en-US/library/aa479405.aspx http://msdn2.microsoft.com/en-us/library/system.web.httpfilecollection.aspx

Naresh Avari · Answer

Yes. I think it is possible in VS 2012. Go through the below link.. http://www.dotnetjalps.com/2012/07/Multiple-file-upload-with-asp-net-4-5-and-Visual-Studio-2012.html