Postgresql and Entity Framework

Question

In my project, I am trying to use Entity Framework with PostgreSql. But I can not connect to my database. I get no mistake, she just gets stuck. I think something is wrong with mine app.config, but I can’t find out what.

App.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <configSections>
        <section name="entityFramework" 
                 type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </configSections>
    <entityFramework>
        <defaultConnectionFactory type="Npgsql.NpgsqlFactory, Npgsql" />
        <providers>
            <provider invariantName="Npgsql" 
                      type="Npgsql.NpgsqlServices, Npgsql.EntityFramework"  />
        </providers>
    </entityFramework>
    <system.data>
        <DbProviderFactories>
            <add name="Npgsql Data Provider" invariant="Npgsql" 
                 description="Data Provider for PostgreSQL" 
                 type="Npgsql.NpgsqlFactory, Npgsql" />
        </DbProviderFactories>
    </system.data>
    <connectionStrings>
        <add name="Entities" 
             connectionString="server=localhost;user id=postgres;password=4321;database=postgis" 
             providerName="Npgsql" />
    </connectionStrings>
</configuration>

DbContext:

public class Entities : DbContext
{
    public Entities() : base("Entities")
    {
    }

    //rest of the code
}

mycode.cs

using (var db = new Entities()) // when debug it stuck here and keep running 
{
 // some test code
}

EDIT:

I get the following error:
"Entity Framework provider type" Npgsql.NpgsqlServices, Npgsql.EntityFramework "registered in the application configuration file for the ADO.NET provider with the invariant name" Npgsql "cannot be loaded. Make sure that the name corresponding to the assembly is used , and assembly is available for the running application.

Answer 1

.

<entityFramework>
    <defaultConnectionFactory type="Npgsql.NpgsqlFactory, Npgsql" />
    <providers>
        <provider invariantName="Npgsql" 
                  type="Npgsql.NpgsqlServices, Npgsql.EntityFramework"  />
    </providers>
</entityFramework>

. , EntityFramework6.Npgsql, EntityFramework6.Npgsql.dll. , :

<providers>
  <provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, EntityFramework6.Npgsql" />
</providers>