// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002095/string-isvalidip

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.IO;

​

public class Program

{

    public static void Main()

    {   

        string [] ips = {"192.102.0.25", "260.120.0.15", "304.120.0.115", "204.120.0.15"};

        foreach(var ip in ips)

        {

            //C# Extension Method: String - IsValidIP

            if(ip.IsValidIP())

            {

                Console.WriteLine("{0} is valid ip address", ip);

            }

            else

            {

                Console.WriteLine("{0} is invalid ip address", ip);

            }

        }

    }

}