Contrary to VO, many datatypes in the .NET Framework don't allow null values.
One of the most important ones is the DataTime class, that cannot have a null value, contrarily to VO, where a date variable can contain null_date.
In the .NET Framework there is the
Nullable datatype, defined as follows:
and to be used like this:
local dDate as Nullable<DateTime> dDate := null dDate := DateTime.Now
Reference types in the .NET Framework don't need
Nullable, they already support null values.
For more information see docs.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/