Help with userform.

Hi,

I have a userform (see attached file). This file is just a subset of my original program.

Background: Userform shows fine and provided the user selects all the appropriate inputs i can extract the data from the userform.

Problem: However, what my code lacks is the proper checks to make sure all the inputs have been selected properly. Can someone help me.
For example: If user selects the option to begin updating the rates from a given date.......but does not select an appropriate date from the list box well my code does not really handle this well.

can someone help me?