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c#strongly-typed-dataset

DBNull warnings when performing stored procedure

One column in my database (of type double) has some null values. I am executing a sored procedure to get the data in my app

 wipDBTableAdapters.XLSFacturiTableAdapter TAFacturi = new wipDBTableAdapters.XLSFacturiTableAdapter();
               var dtfacturi = TAFacturi.GetData(CodProiect);

Then i try to do something like this:

if (dtfacturi[i].CANTITATE == null)
   {
    //do something
   }

this is giving a warning :

The result of the expression is always 'false' since a value of type 'double' is never equal to 'null' of type 'double?

However when i run my code i get the following exception:

StrongTypingException
The value for column 'CANTITATE' in table 'XLSFacturi' is DBNull.

How am I supposed to resolve this ?

Solution

  • While working with data in DB and need to check NULL values use DBNull class instead of .NET null.