Since the introduction of Microsoft asp.net version 1.0, there is a built-in way to build WEB applications that can upload files to the host server. This is accomplished by using the File Field HTML server control. I've written an MSDN article about how to effectively use the control in an ASP.net application. This article will again describe the file upload process, but instead of using the Files Field control, I'll show you how to effectively use the new FileUpload server control provided by ASP.net 2.0.
Although this article introduces you to the new FileUpload server control, it is important to note that you can still use the File Field control in your application.
FileUpload server Control Sample
When you use the File Field control in asp.net 1.x, you must take some extra steps to keep everything running smoothly. For example, you need to add enctype= "Multipart/form-data" to the <form> element of the page yourself. The new FileUpload server control provided in ASP.net 2.0 makes it as simple as possible to upload files to the host server.
Finally, you tried to allow programming of the HTML <input type= "file" > tag. This tag is used with file data in an HTML form. In the past, when traditional ASP (ASP 3.0 or earlier) was used, many programmers used Third-party components to upload files from the client to the server. It is now possible to upload with. NET and the new control. Listing 1 shows how to use the FileUpload control to upload files to the server.
Note provides sample code in the form of Microsoft Visual Basic and C #.
Listing 1. Uploading files to a server using the FileUpload control
Visual Basic
<%@ Page language= "VB"%>
<script runat= "Server"
Protected Sub button1_click (ByVal sender As Object, _
ByVal e as System.EventArgs)
If fileupload1.hasfile Then
Try
Fileupload1.saveas ("C:\Uploads \ & _
Fileupload1.filename)
Label1.Text = "File Name:" & _
FileUpload1.PostedFile.FileName & "<br>" & _
"File Size:" & _
FileUpload1.PostedFile.ContentLength & "Kb<br>" & _
Content Type: & _
FileUpload1.PostedFile.ContentType
Catch ex as Exception
Label1.Text = "Erro R: "& Ex." Message.tostring ()
End Try
Else
Label1.Text = ' You have not specified a file. '
End If
End Sub
</script>
<title>upload files</title>
<body>
<form id=" Form1 " runat= "Server"
<div>
<ASP:FILEUPLOad id= "FileUpload1" runat= "server"/><br/>
<br/>
<asp:button id= "Button1" runat= "Server" onclick= "Button1_Click"
text= "Upload File/> <br/>
<br/>
<asp:label id=" Label1 "runat=" Server "></asp:label></div>
</form>
</body>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
