using System;

using System.Linq;

​

public class Program

{

    public class PersonPOCO

    {

        public string name;

        public string country;

    /* and some more properties in your db */

    }

​

    public static void Main()

    {

        var persons = new[]

        {

            new PersonPOCO

            {

                name = "test",

                country = "FOO"

            },

            new PersonPOCO

            {

                name = "bar",

                country = "FOO"

            }

        };

        var oPerson = new {

            name = "test1",

            country = string.Empty

        };

        var name_country = (from person in persons

                            where person.name == oPerson.name || person.country == oPerson.country

                            select new {

                                person.name,

                                person.country

                            }).DefaultIfEmpty(new {

            oPerson.name,

            oPerson.country

        }).First();

        Console.WriteLine("name: {0}; country: {1}", name_country.name, name_country.country);

    }

}