Code for file upload in asp

This article will demonstrate following concepts:. NET application. HtmlInputFile type of object on the server side.

So if you, like myself, are using a CodeBehind architecture for your page you will have a member field definition similar to this in your class:. HtmlInputFile classes have a few different properties, but the only one that really concerns us here is PostedFile. This property will tell us all we need to know about the file that had been uploaded to our server. The PostedFile property is null if no file was submitted by a client. So, we can simply check whether a file was sent by doing something like this:.

The PostedFile property will contain a valid System. HttpPostedFile object if file indeed was uploaded. HttpPostedFile provides us with 4 properties:. Now that we know the size, we can move on to retrieving the data.

First, we need to allocate a byte array to store the data:. At this point, we have successfully retrieved the uploaded file into a byte array called myData.

What to do with it next depends largely on the requirements of your application. I will show both saving the file to hard drive and to a database in the next sections. I pass a full path of where I want a file to be stored and reference to a buffer with file data to this function.

It uses the System. FileStream object to write a buffer to a disk. This very simplistic 3 lines of code approach will work in most cases. A couple of considerations here are: getting the filename of the uploaded file and the security.

Since the FileName property of PostedFile is a full path to the uploaded file on a client's computer, we will probably want to use only the filename portion of that path.

Instead of using some parsing techniques to look for backslashes and things like that, we can use a very convenient little utility class: System. Security is another matter. In my demo project, I store files in the same folder where the project is executed.

NET processes has to have Write permissions on that folder. By default it does not, so you need to right-click the folder, go to the security tab and add the ASP. NET account to the list. Then grant write permissions to that account by checking the Write checkbox and click OK.

The Access database that I used in the demo project has only one table tblFile that has 5 fields defined as follows:. The code in the above function is very straightforward.

The important thing to note here is that the OleDbCommandBuilder object needs to be created and initialized with a reference to the OleDbDataAdapter object to build the insert query for us automatically. Also, if you would like to retrieve the newly assigned FileID of the file you have just stored in the database, you need to make sure you set the MissingSchemaAction property of Adapter to MissingSchemaAction.

The local ASP. NET account has to have Write permissions to a database file in order for your code to succeed. If your file is placed anywhere under wwwroot , you will need to manually give the database file all the necessary permissions before running my demo project. I used the same ASPX page to read and return file data out of the database in my demo project.

I check for the FileID parameter being passed to a page. If it was passed, I know that I need to return a file rather than process the user's input:. GetFileName FileUpload1. Next Topic ASP. Reinforcement Learning. R Programming. React Native. Python Design Patterns. Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Company Questions. Artificial Intelligence. Cloud Computing. This method contains the SaveAs call to the server. Notice that the file is indeed saved at the specified path in the server.

In our case, our local storage is the server as we are running the application on localhost. To get more advanced training on some of the advanced properties and code behind logics, the official Microsoft documentation is highly recommended. This is a guide to the ASP. NET FileUpload. Here we discuss the introduction, properties, and various examples of ASP.

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Asked 9 years, 4 months ago. Active 3 years, 10 months ago. Viewed 89k times. I want to create a page with asp-classic where users can upload files or zipped folders. Add a comment. Active Oldest Votes. Fields "file". BinaryRead mlngBytesReceived End Sub ' Private Sub ParseDelimiter ' Delimiter seperates multiple pieces of form data ' "around" 43 characters in length ' next character afterwards is carriage return except last line has two -- ' first part of delmiter is dashes followed by hex number ' hex number is possibly the browsers session id?

End ' ' Example: ' Page finnishes executing Stream" ' Let stream know we are working with binary data lobjStream. Write lbinBytes ' Save the binary data to file system ' Overwrites file if previously exists! Call lobjStream. Recordset" ' create field in an empty recordset to hold binary data Call lobjRs. Open ' Add a new record to recordset Call lobjRs.

AddNew ' Populate field with binary data Call lobjRs.