FTP Client uploads only 0KB files - vb.net

Question

I am having a small problem with my FTP client.
Choosing a file works, renaming that file with 4 variables works.
It's the upload that is causing me trouble.
Whenever a file is uploaded to the FTP server it says it is 0KB.
I am thinking of 2 possible problems:
Visual studio tells me that the variable file is used before it has been assigned a value, to make sure it isn't null i did the following.
Dim file As Byte()
If (Not file Is Nothing) Then
strz.Write(file, 0, file.Length)
strz.Close()
strz.Dispose()
FileSystem.Rename(Filename, originalFile)
End If
This Takes care of any possible Errors.
The second one is fName, same warning as with file, and I took care of it the same way.
another possibility is that my code just takes the 4 variables and makes that into a file and uploads it, hence the 0KB size....
Here's my code:
Dim Filename As String
Dim originalFile As String
Private Function enumerateCheckboxes(ByVal path As String)
originalFile = path
Dim fName As String
For Each Control In Me.Controls
If (TypeOf Control Is ComboBox AndAlso DirectCast(Control, ComboBox).SelectedIndex > -1) Then
fName += CStr(Control.SelectedItem.Key) + "_"
End If
Next
Try
fName = path + fName.Substring(0, fName.Length - 1) + ".jpg"
Catch ex As Exception
MsgBox(ex.Message)
MsgBox("Stack Trace: " & vbCrLf & ex.StackTrace)
End Try
Return fName
End Function
Public Function OpenDialog()
Dim FD As OpenFileDialog = New OpenFileDialog()
FD.Title = "Selecteer een bestand"
FD.InitialDirectory = "C:\"
FD.Filter = "All files (*.*)|*.*|All files (*.*)|*.*"
FD.FilterIndex = 2
FD.RestoreDirectory = True
If FD.ShowDialog() = DialogResult.OK Then
Dim Filename As String = FD.FileName
Filename = StrReverse(Filename)
Filename = Mid(Filename, InStr(Filename, "\"), Len(Filename))
Filename = StrReverse(Filename)
MsgBox(enumerateCheckboxes(Filename))
End If
End Function
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim request As System.Net.FtpWebRequest = DirectCast(System.Net.WebRequest.Create("ip" & enumerateCheckboxes(Filename)), System.Net.FtpWebRequest)
request.Credentials = New System.Net.NetworkCredential("username", "password")
request.Method = System.Net.WebRequestMethods.Ftp.UploadFile
Dim file() As Byte
Try
Filename = OpenDialog()
If (Not Filename Is Nothing) Then
System.IO.File.ReadAllBytes(Filename)
End If
Catch ex As Exception
MessageBox.Show(ex.Message)
MessageBox.Show("Stack Trace: " & vbCrLf & ex.StackTrace)
End Try
If (Not Filename Is Nothing) Then
FileSystem.Rename(originalFile, Filename)
End If
Dim strz As System.IO.Stream = request.GetRequestStream()
If (Not file Is Nothing) Then
strz.Write(file, 0, file.Length)
strz.Close()
strz.Dispose()
FileSystem.Rename(Filename, originalFile)
End If
End Sub
End Class
I have looked at multiple threads with the same problem as me.
Threads like this
But i dont believe this applies to my problem.
If you would be so kind to explain what i did wrong and how i can fix and avoid this in the future, my debugging is still a bit rough...
Thank you in advance!

Answer 1

Visual Studio is giving you that warning because you never assign anything to the file array. I think that on the line where you have:
System.IO.File.ReadAllBytes(Filename)
You really meant to have:
file = System.IO.File.ReadAllBytes(Filename)