using System;

using System.Collections.Generic;

using System.Linq;

​

public class AuctionSiteContext : IDisposable {

    public AuctionSiteContext(string connectionString) {

        Sites = new List<Site>();

    }

    public void Dispose() { }

    public int SaveChanges() {

        return 0;

    }

    public List<Site> Sites { get; private set; }       

}

​

public class Site {

    public string Name { get; set; }    

}

​

public class Program {

    public static void CreateSiteOnDb(string connectionString, string name) {            

        try {

            using (var db = new AuctionSiteContext(connectionString)) {

                if (db.Sites.Any(s => s.Name.Equals(name))) throw new Exception(name);

​

                var site = new Site() {

                    Name = name

                };

​

                db.Sites.Add(site);

                db.SaveChanges();

            }

        } catch (Exception) {

            throw;

        }

    }

    public static void Main() {

        CreateSiteOnDb("cs", "name");

        Console.WriteLine("End");

    }

}