Built-in types (C# reference)

The following table lists the C# built-in value types:

C# type keyword .NET type
bool System.Boolean
byte System.Byte
sbyte System.SByte
char System.Char
decimal System.Decimal
double System.Double
float System.Single
int System.Int32
uint System.UInt32
long System.Int64
ulong System.UInt64
short System.Int16
ushort System.UInt16

The following table lists the C# built-in reference types:

C# type keyword .NET type
object System.Object
string System.String

In the preceding tables, each C# type keyword from the left column is an alias for the corresponding .NET type. They are interchangeable. For example, the following declarations declare variables of the same type:

int a = 123;
System.Int32 b = 123;

See also