Error : file is being used by another process - vb.net

Question

I have a problem where it says that a file is already being used by another process
But I am pretty sure it's not being used anywhere else..
Imports System.IO
Public Class Browse
Private Sub add_Click(sender As Object, e As EventArgs) Handles add.Click
Dim Files As New OpenFileDialog
Dim Folder As New FolderBrowserDialog
Dim Filelist As String = "C:\Program Files\FTP-Sync\Files.txt"
Dim FileP As String = ""
Dim list() As String = IO.File.ReadAllLines(Filelist)
If fileb.Checked Then
Try
If System.IO.File.Exists(Filelist) = True And Files.ShowDialog = Windows.Forms.DialogResult.OK Then
FileP = Files.FileName
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
End If
If folderb.Checked Then
Try
If System.IO.File.Exists(Filelist) = True And Folder.ShowDialog = Windows.Forms.DialogResult.OK Then
FileP = Folder.SelectedPath
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
End If
pathtxt.Text = FileP
End Sub
Private Sub ok_Click(sender As Object, e As EventArgs) Handles ok.Click
Dim Filelist As String = "C:\Program Files\FTP-Sync\Files.txt"
Dim writer As StreamWriter = New StreamWriter(Filelist)
Dim FileP As String = ""
Try
If pathtxt.Text = "" Then
MsgBox("No folder or file has been choosen")
Else
writer = File.AppendText(Filelist)
writer.WriteLine(pathtxt.Text)
pathtxt.Text = FileP
writer.Close()
Me.Hide()
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Private Sub cancel_Click(sender As Object, e As EventArgs) Handles cancel.Click
Me.Hide()
End Sub
Private Sub Browse_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
End Class
Thanks in advance!

Answer 1

It was because of this:
Dim writer As StreamWriter = New StreamWriter(Filelist)
i changed it to
Dim writer As StreamWriter
and it work like a charm.. dont know if it is the right way.. but it worked.