public bool NotAvailable()
{
var dt = DateTime.Now;
var dt1 = DateTime.Parse("1/1/1900");
var dt2 = DateTime.Parse("1/1/2200");
return Organization.RegistrationClosed == true
|| Organization.OrganizationStatusId == OrgStatusCode.Inactive
|| dt < (Organization.RegStart ?? dt1)
|| (dt > (Organization.RegEnd ?? dt2));
}