Question

I’m working on a C# project where I declare two class variables:

DateTime creationDate;
byte exRecNo;

The program has a while loop in which those variables get their values assigned.
I would like to reset their values to null after every iteration through the loop so as not to retain values from the previous trip through the loop.

However, when I attempt to do this I get the following error messages:

creationDate = null;

“Cannot convert null to ‘System.DateTime’ because it is a non-nullable value type”

exRecNo = null; 

“Cannot convert null to ‘byte’ because it is a non-nullable value type”

Since I can’t set them to null is there any way that I can clear their values?

Answer 1

To declare a primitive / non-nullable types as nullable use a ?

DateTime? creationDate;
byte? exRecNo;