string providerName = "System.Data.SqlClient";

            SqlConnectionStringBuilder sqlBuilder =
                new SqlConnectionStringBuilder();

            sqlBuilder.DataSource = SettingsSQL.Default.ConnectSQL_Server;
            sqlBuilder.InitialCatalog = SettingsSQL.Default.ConnectSQL_Data;
            sqlBuilder.IntegratedSecurity = SettingsSQL.Default.ConnectSQL_Authentication;
            sqlBuilder.UserID = SettingsSQL.Default.ConnectSQL_User;
            sqlBuilder.Password = cPassword.Text;

            string providerString = sqlBuilder.ToString();

            EntityConnectionStringBuilder entityBuilder =
                new EntityConnectionStringBuilder();

            entityBuilder.Provider = providerName;

            entityBuilder.ProviderConnectionString = providerString;

            entityBuilder.Metadata = @"metadata=res://*/ModelMNTK.csdl|res://*/ModelMNTK.ssdl|res://*/ModelMNTK.msl";

            return entityBuilder.ToString();