I have a Visual Basic front end to a Mathcad 12 worksheet.  The VB app binds user input to variables in the MathCAD worksheet and gets the results without too much trouble.

The problem I have is when the user is done with the app.  I can close the MathCAD worksheet, but I can't seem to close the MathCAD application's process.  I have tried setting it to Nothing, but it still remains.  What is the code to completly close the application?

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'declaration statements
Public MC As Mathcad.Application
Public WK As Mathcad.Worksheets
Public WS As Mathcad.Worksheet

'code to cleanup
WS.Close SaveOption:=mcDiscardChanges
Set WS = Nothing
Set WK = Nothing
Set MC = Nothing
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