C's method of converting numeric data into byte arrays

private void Value_ByteArray()
{
double doublevalue = 258.0;
Int32 intvalue = 258;
string strValue = "258";
Int16 int16value = 258;
MemoryStream doublemem = new MemoryStream();
BinaryWriter doublebyteWR = new BinaryWriter(doublemem);
doublebyteWR.Write(doublevalue);
//doublemem.Close();
BinaryReader doubleReader = new BinaryReader(doublemem);
doublemem.Seek(0, SeekOrigin.Begin);
double heh = doubleReader.ReadDouble();//heh Is, indeed, 257.0
MemoryStream intmem = new MemoryStream();
BinaryWriter intbyteWR = new BinaryWriter(intmem);
intbyteWR.Write(intvalue);
MemoryStream strmem = new MemoryStream();
BinaryWriter strbyteWR = new BinaryWriter(strmem);
strbyteWR.Write(strValue);
MemoryStream int16mem = new MemoryStream();
BinaryWriter int16byteWR = new BinaryWriter(int16mem);
int16byteWR.Write(int16value);
byte[] bufferdouble = doublemem.ToArray();
byte[] bufferint = intmem.ToArray();
byte[] bufferint16 = int16mem.ToArray();
byte[] bufferstr = strmem.ToArray();
}

Program results:

double = 258.0; 8-bit -- 0, 0, 0, 0, 32, 112, 64 byte array
Int32 = 258; 4-2 1 0 0
string = "258"; 4-3 53 50 to 55
Int16 = 258; 2-2 to 1
Int16[] ={0,258,1} ;0 0 2 1 1 0
From the above example, you can see that after converting from numeric type to byte array, the program reads in reverse order, but when it reads, VS will automatically reverse

Int16[] int16Array =new Int16[3]{0,258,1} ;
MemoryStream int16mem = new MemoryStream();
BinaryWriter int16byteWR = new BinaryWriter(int16mem);
foreach (Int16 hehe in int16Array)
{
     int16byteWR.Write(hehe);
}
byte[] bufferint16 = int16mem.ToArray();//0 0 2 1 1 0 
BinaryReader int16Reader = new BinaryReader(int16mem);
int16mem.Seek(0, SeekOrigin.Begin);
Int16[] int16Arraynew=new Int16[3];
for (int i = 0; i < int16mem.Length/2; i ++)
{
int16Arraynew[i] = int16Reader.ReadInt16();//[0,258,1] 
}