How to check if Datarow value is null

Check if the data column is not null with DataRow.IsNull(string columnName)

if (!row.IsNull("Int64_id"))
  // here you can use it safety
   long someValue = (long)row["Int64_id"];

There are overloads for it using the index of the column or if you have the instance of the DataColumn. If you are sure about the index, use the index version which tends to be faster than the other options.

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