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Filter expression for NULL in TimeSpan column

I hava a DataTable with a column of type System.TimeSpan
I need an expression for DataTable.Select() method to select rows with NULL in that column.
Something like:
dataTable.Select("Isnull(OutTime, NULL) = NULL")

I am not sure what to use instead of 'NULL' in the example.
1 Solution
Gautham JanardhanCommented:
dataTable.Select("outtime is null");
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