Handling null dereference in C#

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1.00/5 (1 vote)

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if (conection.State != ConnectionState.Closed) { conection.Close(); }

What I have tried:

What makes the above code free from Null Dereference? Kindly suggest

Posted 28-Sep-17 23:21pm

Madhava_v

Updated 28-Sep-17 23:30pm

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Madhava_v 29-Sep-17 5:33am

Thanks

CPallini 29-Sep-17 6:42am

Only checking for null before would prevent the exception.

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OriginalGriff · Accepted Answer · 2017-09-28T23:30:00

Solution 1

Nothing. If connection is null, it will still throw an exception.
Try this:

if (connection != null && conection.State != ConnectionState.Closed) 
   {
   conection.Close(); 
   }

But better, use a using block around your connection creation so it is automatically closed and disposed when it goes out of scope.

Posted 28-Sep-17 23:30pm

OriginalGriff

Comments

CPallini 29-Sep-17 6:41am

5.