private async Task ValidateCourse(int id)
{
var author = await courseRapository.GetCoursesAsync(id);
if (author == null)
{
throw new NotFoundException("invalid course to delete");
}
courseRapository.DetachEntity(author);
}
private async Task ValidateArea(int id)
{
var author = await areaRapository.GetAreaAsync(id);
if (author == null)
{
throw new NotFoundException("invalid area to delete");
}
areaRapository.DetachEntity(author);
}