Question

I am sure this is a case of basic ignorance, but I’m trying to test a database value using code behind in a Lightswitch project.

I’m checking if a varchar(MAX) value is null

if (Order.OrderNotes.Equals(null))
{
     do.something...
}

However, I get a NullReferenceException if the value is null. If a value is there I get no error. I’ve tried using .contains(null), .Length = 0, .ToString() = “” etc without luck. It seems that ints and dates work fine using Equals(null), but not it seems for a string.

Help!!

Answer 1

Assuming you’re calling this from a details screen where Order != null as @DeeMac pointed out.
You can check that Order isn’t null using the same code below :

if (Order.OrderNotes == null) 
{
    // do.something...
}