I found the code working by changing
static LaundryShopContext()
{
Database.SetInitializer<LaundryShopContext>(
new DropCreateDatabaseIfModelChanges<LaundryShopContext>());
}
into
static LaundryShopContext()
{
Database.SetInitializer<LaundryShopContext>(
new DropCreateDatabaseAlways<LaundryShopContext>());
}