Gets or sets the expression used to filter which rows are viewed in the System.Data.DataView.
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To form a DataView.RowFilter value, specify the name of a column followed by an operator and a value to filter on. The value must be in quotation marks. For example:
"LastName = 'Smith'"
To return only those columns with null values, use the following expression:
"Isnull(Col1,'Null Column') = 'Null Column'"