Convert datatype 'long' to byte array

Question

I have to convert values (double/float in C#) to bytes and need some help..

// Datatype long 4byte -99999999,99 to 99999999,99
// Datatype long 4byte -99999999,9 to 99999999,9
// Datatype short 2byte -999,99 to 999,99
// Datatype short 2byte -999,9 to 999,9

In my "world at home" i would just string it and ASCII.GetBytes().

But now, in this world, we have to make less possible space.
And indeed that '-99999999,99' takes 12 bytes instead of 4! if it's a 'long' datatype.

[EDIT]
Due to some help and answer I attach some results here,

long lng = -9999999999L;
byte[] test = Encoding.ASCII.GetBytes(lng.ToString());  // 11 byte
byte[] test2 = BitConverter.GetBytes(lng);              // 8 byte
byte[] mybyt = BitConverter.GetBytes(lng);              // 8 byte
byte[] bA = BitConverter.GetBytes(lng);                 // 8 byte

There still have to be one detail left to find out. The lng-variabel got 8 byte even if it helds a lower values, i.e. 99951 (I won't include the ToString() sample).

If the value are even "shorter", which means -999,99 -- 999,99 it will only take 2 byte space.
[END EDIT]

Answer 1

Have you checked BitConverter

long lng =-9999999999L;
byte[] mybyt = BitConverter.GetBytes(lng);

hope this is what you are looking

Answer 2

Try to do it in this way:

long l = 4554334;

byte[] bA = BitConverter.GetBytes(l);