Check For Null or Empty String
I found the following piece of code effective:
If str = vbNullString Then ...
If there is an error in a cell formula, like from a VLOOKUP the way around it is to use the
IsError function:
If Not IsError(ActiveWorkSheet.Range("A1")) Then ...
Database Null
A related VB issue is to check for a null value coming from a database query. In this case, you need to use the IsDBNull function
