Differentiating between CDbl(0) and Nothing

[psusme1]

Just make your "Double" variable a "String" and then you can check to see if it is "Nothing" and when you need the "Double" value you can convert it or cast it... VB is usually very forgiving and will perform the cast implicitly for you.

Dim myDbl as String

If myDbl <> String.Empty Then....

OR

If myDbl IsNot Nothing Then....

OR

If myDbl <> Nothing Then....

AND THEN

myDbl = "12.99"

Dim myBool as Boolean = SomeFunctionThatTakesDouble(CDbl(myDbl))
' again you could probably pass a String and VB will do the cast here
' but this is just a basic example.

Shawn