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Problem to DocumentFormat

Last Modified: 2016-07-27
How to correct this
Error	2	'DocumentFormat.OpenXml.Packaging.SpreadsheetDocument' does not contain a definition for 'WorksheetParts' and no extension method 'WorksheetParts' accepting a first argument of type 'DocumentFormat.OpenXml.Packaging.SpreadsheetDocument' could be found (are you missing a using directive or an assembly reference?)

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due to 2nd line below?

                    SpreadsheetDocument Book0 = SpreadsheetDocument.Open(openFileDialog1.FileName, false);
                    WorksheetPart worksheetPart = Book0.WorksheetParts.First();

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