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How to handle blank input by a user?

Question asked by Aaron Torberg on Jun 25, 2015
Latest reply on Jun 26, 2015 by Tapani Sjoman

I have a UserForm TextBox and I want the user to enter an integer (in my program I assign the text box to an integer variable).  I use a case to evaluate different values for the text box but I cannot get my case to handle a blank input, and what about the use of a alpha character or string?  How can I handle these events?  I am very new to this stuff so please go easy on me...