I am stumped with this code. Having just discovered the nul coalescing operator i am trying to convert all my code to use the operator

I converted this

if (dRow["bookid"] != DBNull.Value)
{ BookID = (int?)dRow["bookid"]; }
        else
{ BookID = null; }

to this

BookID = (int?)dRow["bookid"] ?? null;

and now it gives a "Specified cast is not valid" error

How can i correctly convert the first code segment to use the null coalescing operator



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Sorry Guys. I figured it out.
There is no way you can use the null coalescing operator when testing for DBNull.

The thing is DBNull and null are two different things and the ?? operator only tests for null.

It could have been a good thing if the ?? operator worked with dbnull values because these values are ussually checked prior to assigning to some variable


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