I noticed or I should say it was brought to my attention that although I show how to work with files, I never discussed uploading files. Well here it is.
In its simplest form, uploading a file using asp.net VB is quite simple. The following 2 links show how it is done:
http://msdn.microsoft.com/en-us/library/aa478971.aspx
http://support.microsoft.com/kb/323245
This link covers size limitations and how to circumvent it and also other things like multiple file uploads, controlling file types, and other issues.
On another note, if you want to see the code right here and now, just see below (this is how I do it):
In the display page we have the following:
<font face=”verdana”>Select File to Upload:</font>
<input id=”uploadedFile” type=”file” accept=”" runat=”server” />
<input type=”button” id=”upload” value=”Upload” onserverclick=”Page_Load” runat=”server” />
In the code behind we do this:
Make sure you import:
Imports System.IO
Then button_click() you have:
If Not (uploadedFile.PostedFile Is Nothing) Then
Try
Dim postedFile As HttpPostedFile = uploadedFile.PostedFile
Dim filename As String = Path.GetFileName(postedFile.FileName)
Dim fileExt As String = Path.GetExtension(postedFile.FileName)
Dim contentType As String = postedFile.ContentType
Dim contentLength As Integer = postedFile.ContentLength
Dim qryString As String = Request.QueryString(“dir”)
If fileuploaded = True Then
message.Text = “The file was renamed and uploaded successfully.”
postedFile.SaveAs(currentDir & directorySeparatorChar.ToString() & filename)
End If
Catch ex As Exception
message.Text = “Failed uploading file. Please use feedback form.”
End Try
End If
The qryString variable would be the directory you are saving the files to.
This is how I did my qryString;
‘Find out the server name
Dim srvrnm As String = Server.MachineName
‘Set up root directory. Doesn’t matter if live of dev, will know by above statement
Dim currentDir As String = “\\” & srvrnm & “\folder\folder”
To rename the files you would add the following code after the postedFile.saveAs above:
File.Move(currentDir & directorySeparatorChar.ToString() & filename, currentDir & directorySeparatorChar.ToString() & FilereName & fileExt)
A couple of last things, the ASPNET user needs to have permissions to write to the folder you are uploading to. Also, if you upload a file that is already there, it will not overwrite, it will throw an error. You have to try catch that error. You also have to add enctype=”multipart/form-data” to the form tag to allow file to be uploaded.
To allow for larger files than 4Mg you need to add the following code to the web.config file located in the application you are working on (add it inside the <system.web> node):
<httpRuntime
executionTimeout=”90″
maxRequestLength=”4096″ ß This would be changed to indicate size of file in Kb
useFullyQualifiedRedirectUrl=”false”
minFreeThreads=”8″
minLocalRequestFreeThreads=”4″
appRequestQueueLimit=”100″ />
That should work for you. If there are any issues or questions, post them and I will do my best to get back to you with an answer or a solution. Thank you.
