Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Note You can create files pages with different programming languages in the same Web site. Note When you add an existing file, the file is copied to your project not added by reference. Note If the code for the page is in a separate file, Visual Studio automatically renames the code file as well and changes the Page directive in the.
However, when the user uploads a file, FileName contains the user's original name, which includes the entire path. It might look like this:. You don't want all that path information, though, because that's the path on the user's computer, not for your server. You just want the actual file name Sample. You can strip out just the file from a path by using the Path. GetFileName method, like this:. The Path object is a utility that has a number of methods like this that you can use to strip paths, combine paths, and so on.
Once you've gotten the name of the uploaded file, you can build a new path for where you want to store the uploaded file in your website. In this case, you combine Server. You can then call the uploaded file's SaveAs method to actually save the file. In the previous example, you let users upload one file. But you can use the FileUpload helper to upload more than one file at a time. This is handy for scenarios like uploading photos, where uploading one file at a time is tedious.
This example shows how to let users upload two at a time, although you can use the same technique to upload more than that. In this example, the FileUpload helper in the body of the page is configured to let users upload two files by default. Because allowMoreFilesToBeAdded is set to true , the helper renders a link that lets user add more upload boxes:. To process the files that the user uploads, the code uses the same basic technique that you used in the previous example — get a file from Request.
Files and then save it. Including the various things you need to do to get the right file name and path. The innovation this time is that the user might be uploading multiple files and you don't know many. To find out, you can get Request. With this number in hand, you can loop through Request. Files , fetch each file in turn, and save it. When you want to loop a known number of times through a collection, you can use a for loop, like this:.
The variable i is just a temporary counter that will go from zero to whatever upper limit you set. In this case, the upper limit is the number of files. But because the counter starts at zero, as is typical for counting scenarios in ASP. NET, the upper limit is actually one less than the file count. If three files are uploaded, the count is zero to 2. The uploadedCount variable totals all the files that are successfully uploaded and saved.
This code accounts for the possibility that an expected file may not be able to be uploaded. Working with Images in an ASP. Exporting to a CSV File. Skip to main content. This browser is no longer supported. Now the handler code may look as follows:.
As a result, you will get the same upload interface, but the text box displays the number of selected files:. The FileUpload control is great when you only upload a few small files, but it has several disadvantages:. Fortunately, some third party uploaders are partially free of these concerns.
Nowadays all popular browsers support the Flash or newer HTML5 platform, which allows the creating of advanced file upload using Flex or JavaScript respectively. Thus, there are a lot of third-party uploaders. These uploaders are very good at multiple file upload, provide a simple interface, and are supported by a big community of developers. However, the following tasks cannot be solved by these uploaders:.
How to upload files in ASP. NET Nowadays you may find file upload in almost every website — from forums that allow users to upload photos for their avatars, to online auctions where users can create galleries with a lot of images.
Files Upload Basics The upload process is quite simple. The client application packs these files to a POST request and sends it to the server. The server parses the request, handles it for example, saves files on a hard disk , and sends a response to the client side. NET the default value is seconds. The form should also contain id , name , and method attributes.
Typically they are automatically generated by ASP. The onClick attribute of the Upload File button specifies the event handler that processes file upload. RegisterStartupScript this, this. Ratna Ratna 2, 2 2 gold badges 23 23 silver badges 48 48 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses.
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