c# - How to check remote IP and Port is available?

Question

I have to check remote IP and Port is available or not.If its is available it will move to next form.If not available it should come to the initial state.I tried using this

while (true)
{
    IPGlobalProperties ipProperties = IPGlobalProperties.GetIPGlobalProperties();
    IPEndPoint[] ipEndPoints = ipProperties.GetActiveTcpListeners();
    -------
    -------
    -------
}

I am showing the example coding.it was checking local IP and port and moving to next form.it will check local port and IP is available.if port and IP not available it will come to the initial stage and it was working fine.same thing i have to check in remote Port and IP.

Answer 1

Use the Ping class of .NET to find out if the system is up and connected, the use the PortScanner to check if the port is open. check these links for further reading and exploring.

http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ping%28v=vs.110%29.aspx

http://social.msdn.microsoft.com/Forums/vstudio/en-US/8e4410bd-307f-4264-9575-cd9882653945/help-with-portscanner-in-c?forum=csharpgeneral

OR

public static bool PingHost(string hostUri, int portNumber)
{
    try
    {
        using (var client = new TcpClient(hostUri, portNumber))
            return true;
    }
    catch (SocketException ex)
    {
        MessageBox.Show("Error pinging host:'" + hostUri + ":" + portNumber.ToString() + "'");
        return false;
    }
}