how to use DataTable.Select() to select Null/ empty values?

Question

My data table filled from db is having empty values in some cells.

The results database SP return has Null in them but in DataTable these values are appearing as \'\' or

Answer 1

For one column

DataRow rows = DataTable.Select("[COLUMN 1]=''");

For more than one column

DataRow rows = DataTable.Select("[COLUMN 1]='' OR [COLUMN 2]=''");