Class memory in C#

Type	Size in Bytes	Description	Minimum	Maximum
bool	1	Named literal	false	true
sbyte	1	Signed byte	-128	127
byte	1	Unsigned byte	0	255
short	2	Signed short integer	-32768	32767
ushort	2	Unsigned short	0	65535
int	4	Signed integer	-2147483648	2147483647
uint	4	Unsigned integer	0	4294967295
long	8	Signed long int	-9.2233E+18	9.2233E+18
ulong	8	Unsigned long int	0	18446E+19
char	2	Unicode character, contained within single quotes.	0	128
float	4	floating point	-3.402823E+38	3.402823E+38
double	8	Floating point	-1.7976931E+308	1.7976931E+308
decimal	16	Floating point, accurate to the 28th decimal place.	-7.9228E+24	7.9228E+24
object	8+	Base type for all other types	n/a	n/a
string	20+	Immutable character array	n/a	n/a
DateTime	8	Represents an instant in time, typically expressed as a date and time of day.	00:00:00 01/01/0001	23:59:59 31/12/9999

So as you can see size of int and char is 4 and 2 respectively, size of class is 6 bytes.

Thank You.

Well, a char field requires 2 bytes and an int field requires 4 bytes, making 6 bytes in total.

However, on a 32 bit system, each object of a class requires 8 bytes of overhead and on a 64 bit system the overhead is 16 bytes. 

So, the total heap memory needed will be at least 14 bytes (32 bit system) or 22 bytes (64 bit system). 

Also, to improve processor efficiency, the fields of an object may not be laid out contiguously. Any 'unused' bytes between fields will therefore further increase the memory needed for the object.