using System;

public class Program

{

    public static void Main()

    {

        Datos Data = new Datos();

        Data.Datos1="Datos1";

        Data.Datos2="Datos2";

        Data.FirstName="luis";

        Data.MiddleName=null;

        Data.LastName="lopez";

        Data.SecondLastName=null;

        Console.WriteLine(Data.GetFullName());

    }

    public class Datos

    {

        public string Datos1 { get; set; }

        public string Datos2 { get; set; }

        public string FirstName { get; set; }

        public string MiddleName { get; set; }

        public string LastName { get; set; }

        public string SecondLastName { get; set; }

        public string GetFullName()

        {

​

                string FirstNameConc=string.IsNullOrEmpty(this.FirstName?.Trim())?"":this.FirstName?.Trim()+" ";

                string MiddleNameConc=string.IsNullOrEmpty(this.MiddleName?.Trim())?"":this.MiddleName?.Trim()+" ";

                string LastNameConc=string.IsNullOrEmpty(this.LastName?.Trim())?"":this.LastName?.Trim()+" ";

                string SecondLastNameConc=string.IsNullOrEmpty(this.SecondLastName?.Trim())?"":this.SecondLastName?.Trim();

                return (FirstNameConc+MiddleNameConc+LastNameConc+SecondLastNameConc).Trim().ToUpper();

        }

​

    }

}