VS 2015 Localdb error 26

Question

I am trying to get the attached program to work, but I get an error 26 cannot find server for the local db. This is a straight MSDN example. I can open the localdb with SSMS 2014, part of the sql express installation. Also in VS 2015 I can create a database connection to the localdb with (localdb)\\mssqllocaldb. The EF is version 6 (latest downloaded with NuGet).I have no idea why this is not working.

The code is:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.Entity;

namespace ConsoleApplication8
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var db = new BloggingContext())
            {
                // Create and save a new Blog 
                Console.Write("Enter a name for a new Blog: ");
                var name = Console.ReadLine();

                var blog = new Blog { Name = name };
                db.Blogs.Add(blog);
                db.SaveChanges();

                // Display all Blogs from the database 
                var query = from b in db.Blogs
                            orderby b.Name
                            select b;

                Console.WriteLine("All blogs in the database:");
                foreach (var item in query)
                {
                    Console.WriteLine(item.Name);
                }

                Console.WriteLine("Press any key to exit...");
                Console.ReadKey();
            }
        }
    }
    public class Blog
    {
        public int BlogId { get; set; }
        public string Name { get; set; }

        public virtual List<Post> Posts { get; set; }
    }

    public class Post
    {
        public int PostId { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }

        public int BlogId { get; set; }
        public virtual Blog Blog { get; set; }
    }

    public class BloggingContext : DbContext
    {
        public DbSet<Blog> Blogs { get; set; }
        public DbSet<Post> Posts { get; set; }
    }
}

Maarten

Answer 1

use (localdb)\\\\mssqllocaldb instead of (localdb)\\mssqllocaldb . See \\\\ .

\\ is a escape character so you need to use two. I guess this is the problem.

Answer 2

did you add sql connection ?

using System.Data.SqlClient;

"user id=username;" +"password=pass.;server=servername;" + "Trusted_Connection=yes;" +"database=tablo_1; " + "connection timeout=30"

the servername should be like this : DESKTOP-I....\\\\SQL_2014;