For instance, in my coding I using the VB function 

```
Round(1.325, 2)

```

Which produces the number 1.33. I am wondering if there is a place to view the code behind the "Round" function so that I can produce my own. 

Reason for the question:

I was recently asked in an interview to produce a reverse function that does not use the .Reverse function from the .net library. I nailed it, but there are other basic functions to learn such as formatting a number to a set amount of decimal places. Being able to look at the code behind the .net library functions would aide me in this pursuit.

TIA - Thanks in advance.

James