I am new to this VB macro stuff, so I am looking for a little help.

I have a worksheet that I want the user to NOT be able to leave certai
fields blank. How do I create a macro that will do that and issue
message box telling them that they must enter a value in this cell?
I will have several cells that I want to check.
Can this be done before they save and close the spreadsheet?
Thanks
d

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