string connectionString = new EntityConnectionStringBuilder
                    {
                        Metadata = "res://*",
                        Provider = "System.Data.SqlClient",
                        ProviderConnectionString = new System.Data.SqlClient.SqlConnectionStringBuilder
                            {
                                DataSource = @".\SQLEXPRESS",

                                InitialCatalog = "nomeDataBase",
                                //IntegratedSecurity = false,
                                UserID = "nomeutente",
                                Password = "password",


                                //AttachDBFilename = @"c:\percorsoWebApp\App_Data\ASPNETDB.MDF",

                                //UserInstance = true,
                                //IntegratedSecurity = true,

                            }.ConnectionString
                    }.ConnectionString;