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The intrinsic types

C# type Size (in bytes) .NET type Description
byte 1 Byte Unsigned (values 0-255).
char 2 Char Unicode characters.
bool 1 Boolean True or false.
sbyte 1 SByte Signed (values -128 to 127).
short 2 Int16 Signed (short) (values -32,768 to 32,767).
ushort 2 UInt16 Unsigned (short) (values 0 to 65,535).
int 4 Int32 Signed integer values between -2,147,483,648 and 2,147,483,647.
uint 4 UInt32 Unsigned integer values between 0 and 4,294,967,295.
float 4 Single Floating point number. Holds the values from approximately +/-1.5 * 10-45 to approximately +/-3.4 * 1038 with 7 significant figures.
double 8 Double Double-precision floating point; holds the values from approximately +/-5.0 * 10-324 to approximately +/-1.8 * 10308 with 15–16 significant figures.
decimal 12 Decimal Fixed-precision up to 28 digits and the position of the decimal point. This is typically used in financial calculations. Requires the suffix "m" or "M."
long 8 Int64 Signed integers ranging from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
ulong 8 UInt64 Unsigned integers ranging from 0 to approximately 1.85 * 1019.