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+====== Nullable Datatypes ======
+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:
+<code>Nullable<T></code>
+and to be used like this:
+<code>local dDate as Nullable<DateTime>
+dDate := null
+dDate := DateTime.Now</code>
+Reference types in the .NET Framework don't need ''Nullable'', they already support null values.
+For more information see [[https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/|docs.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/]]