Validating data in a user form

Is there a way to validate data typed into the user form? I tried validating the actual cells that the data adds to, and that didn't work.
For instance, I have a drop-down list now, but the way it is I can either choose from the list, or type in anything I want. What if I only want values from the list to be allowed? Is there a way to do such a thing?

Hello Kim_J,

Here is the code to restrict the user's input to the list in your ComboBox. The example uses a UserForm, a ComboBox, and a CommandButton. You can change the names and the loading of the ComboBox to match your needs. The code disables the user from using the Close Box on the title bar. You must close your form using a Command Button.

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Sincerely,
Leith Ross

Thank you so much for the reply. That helps a lot.

How would I validate data that wasn't from a list? Like if it needed to be a date, or a certain text length?

Thanks.