List all the files from ftp in VB.NET

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VB

FTP

I going to do the list box to show all my files in the ftp server so that the user can select the files and download it. After i typed my ftp server ip address "ftp://192.168.10.1/ in the textbox then clicked the button for display all files listed in the ftp. It shows the messages invalid url : the hostname cannot be parsed. But, I can view all my files in the web browser by typing the correct ftp address. By the way, I am using the ftpclient.dll for the references from https://www.codeproject.com/Articles/11991/An-FTP-client-library-for-NET. Please help me to solve the problems or figure out other ways to doing it. Thanks for your helps.

What I have tried:

Public Class FileSharingForm
Private FTPDownloader As New Utilities.FTP.FTPclient

Private Sub FileSharingForm_Load(sender As Object, e As EventArgs) Handles     MyBase.Load
btnChangeDirectory.Enabled = False
FTPDownloader.Hostname = txtServer.Text.Trim
FTPDownloader.Username = txtUsername.Text
FTPDownloader.Password = txtPassword.Text

End Sub

Private Sub btnHomeDirectory_Click(sender As Object, e As EventArgs) Handles      btnHomeDirectory.Click
FTPDownloader.CurrentDirectory = /;
RefreshList()
End Sub

Private Sub RefreshList()
ListFTPFiles.Items.Clear()
Try
For Each file In FTPDownloader.ListDirectoryDetail()
    ListFTPFiles.Items.Add(file.Filename)
Next
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub

End Class