Include these namespaces in your class:
using System.Net.NetworkInformation;
using System.Net;
The actual method to get the first open port from the system is as follows:
private string GetOpenPort()
{
int PortStartIndex = 1000;
int PortEndIndex = 2000;
IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
IPEndPoint[] tcpEndPoints = properties.GetActiveTcpListeners();
List<int> usedPorts = tcpEndPoints.Select(p => p.Port).ToList<int>();
int unusedPort = 0;
for (int port = PortStartIndex; port < PortEndIndex; port++)
{
if (!usedPorts.Contains(port))
{
unusedPort = port;
break;
}
}
return unusedPort.ToString();
}
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