How to Add an entry to the host file from VB.Net

I need to add an entry to the host file from a program that i am writing in VB.Net. I have tried to change the code in the following post but can’t get it to add rather than edit. Can someone please help me as I am running out of time to get the program finished.
All help will be greatly appreciated
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See output line, that's the most important one to watch (I just added something random):

        Dim Hosts As String = Environment.SystemDirectory & "\drivers\etc\hosts"
        Dim sr As New StreamReader(Hosts)
        Dim input As String = sr.ReadToEnd()
        Dim output As String = input + vbNewLine + " router"
        Dim sw As New StreamWriter(Hosts)

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käµfm³d 👽Commented:
If it's not obvious, since the hosts file is in a protected system directory, any application that modifies it will need to be running with administrator privileges.
JNeetsAuthor Commented:
Thanks Kimputer for the code I tryed it out and it worked purfectly. also thanks Kaufmed for the reminder that the program will have to run with administrator privileges.
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Visual Basic.NET

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