These types are supported as either nullable or non-nullable:

bool
byte
char
decimal
double
float
int32
int64
sbyte
short
string
uint32
uint64
ulong
ushort
DateTime
Structs
Arrays
Multi-Dimensional Arrays
ICollection
IList
IDictionary
ObservableCollection
Public Fields
Public Properties
Enums
Timespan
GUID
Double Linked Lists and Trees
BitArray