Close closes the particular part of the program,if it is used on the main form or window,it closes the entire application,while exit shutdowns the application as a whole.
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For example in Visual Basic 6, if you are checking whether a user is typed a date in correct format it or not if isdate( text1.text ) then else exit sub end if ' If one typed wrong date i.e. 30.2.2010 vb will check whether the date is in correct format or not. In this case exit sub will exit the argument and till showing the Text box to get another corrected date. But close command means 'the application really end the programe.
Close only exit from the particular Form of Application.
End command close entire application.
End command close entire application.