public IActionResult OnPost()
{
if (ModelState.IsValid)
{
if (MembershipExists(Membership.Id) == false)
{
Membership = membershipData.CreateMembership(Membership);
}
else
{
Membership = membershipData.Update(Membership);
}
membershipData.Commit();
return(RedirectToPage("./List"));
}
return(Page());
}