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Built-In Types Table (C# Reference)

The following table shows the keywords for built-in C# types, which are aliases of predefined types in the System namespace.

C# Type

.NET Framework 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

object

System.Object

short

System.Int16

ushort

System.UInt16

string

System.String

All of the types in the table, except object and string, are referred to as simple types.

The C# type keywords and their aliases are interchangeable. For example, you can declare an integer variable by using either of the following declarations:

int x = 123;
System.Int32 x = 123;

To display the actual type for any C# type, use the system method GetType(). For example, the following statement displays the system alias that represents the type of myVariable:

Console.WriteLine(myVariable.GetType());

You can also use the typeof operator.

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