C# crud with sql server

using (SqlConnection con = new SqlConnection("Server=USER_PC;Database=CompanyName;User Id='';Password=''"))
            {
                con.Open();
                using (SqlCommand com = new SqlCommand("SELECT CompanyName FROM CompanyTable", con))
                {
                    using (SqlDataReader reader = com.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            string strCompanyName = "";

                            Console.WriteLine("Company Name: {0}\n    {1}", strCompanyName);
                        }
                    }
                }
            }

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

And the green arrow points to this   : con.Open();

What am I missing ?

Please let me know if I must put screen shots of the problem to make it easier.

Thanks