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.