C# | Aliases of built-in types

Built-In Types Table

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

|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

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 number = 123;
System.Int32 number = 123;