Network Throughput Detection (c#)

Question

Hi All I'm writing some code that suppose to send UDP packets from one of the available network interfaces. The logic I want to use is to send from the less busy interface. I'm trying to figure out a way to monitor the outgoing throughput without using the perfrmance counters since finding out the IP to bind from the performance counter instance is not simple (if possible at all). I can track what I send but I need to assume that other processes can send what ever they like. Any idea? Thanks!

Lior Ohana · Answer

Nice trick I didn't think about it :-) However It is not possible since I must keep it alive. Thanks.

Roei Bar · Answer

if you have an option to disable the NIC for testing it will work since you will get only the one that is active on the performanceCounter

Lior Ohana · Answer

Hi Thanks for the reply. As I wrote I'm looking for a solution without the usage of performance counters. The problem with these counters that it is impossible to make the connection between the counter instance to the the NICs IP address. For example in case we have two adapters of the same type: Intel PRO 1000 GT. One NIC is 10.60.1.1 and the other is 10.60.1.2. When retrieving the counters we will get two instances both with the same name: Intel PRO 1000 GT. How will I know which counter means which interface?

Roei Bar · Answer

here is a sample code: System.Diagnostics.PerformanceCounter performanceCounter1; performanceCounter1 = new System.Diagnostics.PerformanceCounter(); performanceCounter1.CategoryName = Network Interface; performanceCounter1.CounterName = Bytes Sent/sec; performanceCounter1.InstanceName = 3Com 3C920 Integrated Fast Ethernet Controller [3C905C-TX Compatible] - Packet Sc + heduler Miniport; performanceCounter1.MachineName = sha-lion-01; MessageBox.Show(performanceCounter1.NextValue().ToString());