public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: false, reloadOnChange: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
var connectionString = Configuration.GetConnectionString("DefaultConnection");
var migrationNamespace = Configuration["ConfigSettings:MigrationNamespace"];
BaseRepository.ConnectionString = connectionString;
MigrationHelper.CreateDbIfNoneExists(connectionString);
MigrationHelper.MigrateUp(connectionString, migrationNamespace);
MapperHelper.MapAllEntities();
}