Hi, all

I am trying to build a user form to find out the customers who purchase more than $1,000 during a certain period.

The userform has two inputs:

One is to select the data range of customer information. Assume all customer information are in the cell A2: H10, how shall I write the error checking code if the user selects the range which is out of (A2:H10)? message box would be " You selection include invalid data, please check"..

The other input is called " Get data past this data", and I can enter a date in the following cell ( txtDate). Regarding the error checking, I am thinking to use IsDate() function to make sure it is a valid date. Will be there be any other error checking you will recommend?

Any help is appreciated. thank you!!!