Write A DLL That Will Take Two Parameters?

I am trying to write a DLL that will take two parameters; a path and the text to write text to said path.

I want to be able to call this function from any other language that can be coded on windows, but nothing happens when I try to use this?

Public Class UTF16TextFile

Public Function UTF16TextFile(ByVal path As String, ByVal text As String) As String
Dim fs As New IO.FileStream(path, IO.FileMode.Create)
Dim sw As New IO.StreamWriter(fs, System.Text.Encoding.BigEndianUnicode)
sw.WriteLine(text)
sw.Close()
fs.Close()
End Function
End Class