I usally cast datetime and null values to (Date Time? When DOBGiven is false then DOB can be anything (I would prefer Date Time. Min Value because often a database will not be able to store Min Value).
This set contains two elements, namely the null set and the set containing the null set and, therefore, cannot be the null set. It is denoted either by (curly brackets) or Ø (slashed zero). We have over 160 college courses that prepare you to earn credit by exam that is accepted by over 2,000 colleges and universities.
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Your code will have statements like if (DOBGiven) rather than if (DOB == Date Time. Hi anders, It is true that you can't get an invalid date with the nullable type, you would just get an exception if you used . Either way, it is a bug which should be caught by you TDD methods.
You code may be more complex but it should be easier to understand. Have a nice day a Date; a Date = Get From Database(); // if you get Date then it must be in a Date. Vaue will be null; ----- a Date = null; a Date = Date Time. If using nullable types you get the same advantage, but without the risk of using an invalid date. Because the compiler won't let me use a Date Time unless it has been initialised I would probably end up with a screen that shows a DOB as 1/1/1 and using the nullable type I would have an exception and no screen at all, take your pick. To me, the Has Value property is a detail of the CLR (or is it the language? It's a case of the low-level technical details versus the business case that is being addressed.
Private Sub a Sub(Optional an Arg As Integer) Debug. Byte dumps for Empty and Null: Empty = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 Null = 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0So, back to the original question, using a variant of subtype date rather than a proper date variable would seem the way to go: Dim dd As Date Dim dv As Variant dd = Now: Debug. Print Type Name(dv) & " - " & dv 'dd = Null: Debug.
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You're right, I thought I knew what should happen and got confused :whoops: I thought Null was for numerical variables, Empty for Variants. EDIT: Okay, this ( Var Type.asp) explains the difference.
Firstly, I think you are probably talking about some sort of input widget (a text box?
Give some thought to the logic/business reason for what is happening in your application.
The null set, also referred to as the empty set, is the set that contains no elements.
For example, suppose somebody asked you to find the set of all senior citizens who are less than five years old.