isValidIPV4.cs

using System;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hello World");
		string ipString = "192.168. 1.1";
		Console.WriteLine("isValidIPV4 "+ipString+":"+isValidIPV4(ipString));
		
	}
	
  static bool isValidIPV4(string address)
  {
      if ( address == null  )
          return false;

      if ( address == "" )
          return false;

      var numbers = address.Split('.');

      if (numbers.Length != 4)
          return false;

      foreach (var stringNumber in numbers)
      {
          int number;

          bool success = Int32.TryParse(stringNumber, out number);

          if (success == false)
              return false;

          if (!(0 <= number && number <= 255))
              return false;
      }

      return true;
  }
}

Code made for a call interview

Write logic using C# to validate an IPV4 address format. (a method which takes string as parameter and returns boolean as response)