How to Check TCP Port Availability in C#?

How can you check if a TCP port is available in C#?

When establishing a connection using TcpClient or any socket, it's beneficial to verify the availability of the desired port on your machine. Here's how you can approach this:

To check the availability of a TCP port in C#, you can utilize the IPGlobalProperties object and its GetActiveTcpConnections() method within the System.Net.NetworkInformation namespace. This approach provides a robust way to assess the current TCP connections on your system.

The following code demonstrates how you can implement this check:

int port = 456; // Replace with the port you want to check
bool isAvailable = true;

// Get the current TCP connections
IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
TcpConnectionInformation[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpConnections();

// Check if the specified port is already in use
foreach (TcpConnectionInformation tcpi in tcpConnInfoArray)
{
    if (tcpi.LocalEndPoint.Port == port)
    {
        isAvailable = false;
        break;
    }
}

// Proceed further if the port is available
if (isAvailable)
{
    // Your code for utilizing the port
}

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