Getting upper and lower byte of an integer in C# and putting it as a char array to send to a com port, how?

Question

In C I would do this

int number = 3510;

char upper = number >> 8;

char lower = number && 8;

SendByte(upper);

SendByte(lower);

Where upper and lower would both = 54

In C# I am doing this:

            int number = Convert.ToInt16("3510");
            byte upper = byte(number >> 8);
            byte lower = byte(number & 8);
            char upperc = Convert.ToChar(upper);
            char lowerc = Convert.ToChar(lower);
            data = "GETDM" + upperc + lowerc;
            comport.Write(data);

However in the debugger number = 3510, upper = 13 and lower = 0 this makes no sense, if I change the code to >> 6 upper = 54 which is absolutely strange.

Basically I just want to get the upper and lower byte from the 16 bit number, and send it out the com port after "GETDM"

How can I do this? It is so simple in C, but in C# I am completely stumped.