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