title: How to use a user defined function in all excel without an additional operation?
body: <p>I have a simple function that converts a range into <code>CSV</code> format. I am using this function every time and in every excel files. So I need this function to exist in all <code>Excel</code> workbooks default, no need extra load as <code>Excel's</code> default formulas (e.g <code>VLookUp</code>). How can I do that?</p>
  
  <p><strong>User-Defined Function in Module:</strong></p>
  
  <pre><code>Public Function csvformat(r As range, seperator As String)
  result = ""
  For Each cell In r
  result = result &amp; cell &amp; seperator
  Next
  result = Left(result, Len(result) - 1)
  csvformat = result
  End Function
  </code></pre>