User Form Error Messages

Hi.

I have a user form with a few inputs (see attached image). A filename, subject, and email option all need to be entered/chosen.

I would like to have a dynamic error message for the end user. How do I create the message box to show a message letting the user know which items are missing? For example, may be, "You are missing a filename," or, "You are missing a filename and subject," etc.

Thanks.

Something like the following might work for you. Obviously you would need to adjust the object names, and you can add others as needed.

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Thanks! Just a note to others who may find this, I tweaked it a little bit.
Where there is, 'do stuff if there are no errors, I put:

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and had success: starting after the end sub.