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Built-in Types Table

Visual Studio .NET 2003

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:


You can also use the typeof operator.

See Also

C# Keywords | Value Types | Default Values Table | Formatting Numeric Results Table | Types Reference Tables