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Message: [QUOTE="Shankar_R, post: 157585, member: 45553"] As an update, I found a fix- declare Before and After as Objects instead of Integer. (Key still needs to remain as String. Apparently the 'Nothing' value of Key is passed on properly. If I replace the msgbox statement by MsgBox Key=vbnullstring, I get true. However, if I call the Add method twice using vbnullstring as the key explicitly, I get an error for key clash. Doesn't happen when I use 'Nothing' as the argument though. Seems a bit counter-intuitive since I would assume that since Key is strongly typed to be a string, 'Nothing' would be reduced to vbNullString (as is confirmed by the Msgbox), but clearly something else is going on! [/QUOTE]