Question

Because I am using a “using” here, If there is an exception any where in the TRY will the FtpWebRequest, FtpWebRespons and responseStream automatically be closed?

Try
 Dim request As FtpWebRequest = CType(WebRequest.Create(""), FtpWebRequest)
        request.Method = WebRequestMethods.Ftp.ListDirectoryDetails

        request.Credentials = New NetworkCredential("", "")
        Using response As FtpWebResponse = CType(request.GetResponse(), FtpWebResponse)

            Using responseStream As Stream = response.GetResponseStream()
                Using reader As New StreamReader(responseStream)


                    TextBox1.Text = reader.ReadToEnd
                    TextBox1.Text += vbNewLine 
                    TextBox1.Text += vbNewLine
                    ' Use the + for appending (set the textbox to multiline)

                End Using

            End Using

        End Using    

Catch ex As Exception
     MessageBox.Show(ex.Message.ToString())
End Try

Answer 1

Yes they will be disposed of except for when there is a Stack Overflow. From the documentation:

A Using block behaves like a Try…Finally construction in which the
Try block uses the resources and the Finally block disposes of them.
Because of this, the Using block guarantees disposal of the resources,
no matter how you exit the block. This is true even in the case of an
unhandled exception, except for a StackOverflowException.