Return TRUE if the expression is an error value.
Syntax IsError(expression) Key expression A variable.
The IsError() function may be used in VBA.
Dim myvar, mycheck
myvar = someFunction()
mycheck = IsError(myvar)
“An optimist will tell you the glass is half-full; the pessimist, half-empty; and the engineer will tell you the glass is twice the size it needs to be”
Nz - Detect a NULL value.