public void RemoveSheetTest() { MemoryStream stream = SpreadsheetReader.Create(); SpreadsheetDocument doc = SpreadsheetDocument.Open(stream, true); var result = SpreadsheetWriter.RemoveWorksheet(doc, "Sheet2"); Assert.IsTrue(result, "A worksheet was not removed from the document."); //Save to the memory stream, and then to a file SpreadsheetWriter.Save(doc); SpreadsheetWriter.StreamToFile(string.Format("{0}\\removesheet.xlsx", GetOutputFolder()), stream); }