using System;

using System.Linq;

public class Program

{

    public static void Main() {

​

        var client = new Client();

        client.FirstName = "James";

        client.LastName = "";

        client.Birthdate = new DateTime(1953, 1, 4);

        client.Email = "James@example.com";

        client.Other = "Something";

        var propertyValuesByName = client.GetType().GetProperties()

            .Where(pi => pi.PropertyType == typeof(string))         

            .Select(pi => new { Val = (string) pi.GetValue(client), Name = pi.Name })

            .Where(pi => !string.IsNullOrEmpty(pi.Val))

            .ToDictionary(pi => pi.Name, pi => pi.Val);

        foreach(var prop in propertyValuesByName) {

            Console.WriteLine(prop.Key + ":\t " + prop.Value);

        }

    }

    public class Client {

        public string FirstName { get; set; }

        public string LastName { get; set; } 

        public DateTime Birthdate { get; set; }

        public string Email { get; set ;}

        public string Other;

    }

}