c# convert short/int value to byte array in bigendian

short val = 0x1234;

sendData[0] = (byte)(val >> 8);

sendData[1] = (byte)val;

int val2 = 0x12345678;

sendData[0] = (byte)(val2 >> 24);

sendData[1] = (byte)(val2 >> 16);

sendData[2] = (byte)(val2 >> 8);

sendData[3] = (byte)val2;