Using C#, code this program using functions

Develop a public function that calculates and returns the average length of a server queue. For an M/M/1 queue (single server, exponential processing and arrival rates), L_q = 21- , while for an M/G/1 queue (single server, exponential arrival rate and any distribution for processing rate) L_q = 2s2+22(1-) ; r is utilization of the server (a value 0 and < 1), l is the arrival rate to the queue per unit time (value > 0), and s_s is the standard deviation of the server processing time (value > 0). These values should be passed to the function (l and s_s should be optional arguments). Use an enumeration to define the queue type. The function should print an error message and then throw an exception if any of the arguments are out of range.