How to check DBNull value in Linq query results

Question

I am using the below code and trying to group by Currency and Code. After this I am trying to loop through the result set.

But the issue is while looping through the

Answer 1

This:

amount = grp.Sum(x => Convert.ToDouble(x["AMOUNT"]))

will not work as you expect. If x["AMOUNT"] is DBNull.Value instead of a valid double, the conversion will fail with an exception. Instead, try:

amount = grp.Sum(x.Field("AMOUNT"))

if you expect that field to be a double. Sum will treat the null values as zero, per MSDN.