Question

I’m getting an object reference not set to an instance of an object error in the condition of a while loop and I don’t know what it’s happening. The code is:

while (ClassName.StaticDataTable == null || ClassName.StaticDataTable.Rows == null)

I tried to make the object names explanatory. I thought || was a short circuit operator so that if the first condition was true it wouldn’t evaluate the second one and that the error shouldn’t be coming from there. Any ideas on what is causing the error?

Answer 1

If you’re getting null reference exception on

while (ClassName.StaticDataTable == null || ClassName.StaticDataTable.Rows == null)

I think of for example:

ClassName == null

So may be (just guess) for you would be enough to add one || condition more in front of others already present, like

while (ClassName == null || ClassName.StaticDataTable == null || ClassName.StaticDataTable.Rows == null)

EDIT

There could be also a case if StaticDataTable property not just returns a value but does something inside it which throws null reference exception. Try to dig into that property.

Hope this helps.