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copied!<p>Ok, I got this working, though through some effort. To create the stream:</p> <pre><code>MemoryStream stream = new MemoryStream(); using (SpreadsheetDocument package = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook)) { Excel.CreateSpreadsheet(package, Excel_Methods.CreateSpotQuoteOut(), true); } stream.Seek(0, SeekOrigin.Begin); System.Net.Mail.Attachment attach = new System.Net.Mail.Attachment(stream, "spreadsheet.xlsx"); attach.ContentDisposition.CreationDate = DateTime.Now; attach.ContentDisposition.ModificationDate = DateTime.Now; attach.ContentDisposition.Inline = false; attach.ContentDisposition.Size = stream.Length; attach.ContentType.MediaType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; </code></pre> <p>Also, I found that mine were not being sent right after I created them, and the reason for that is "standalone=yes" was not being added to the xml declaration of all the pages, so in my AddParts function, after adding the parts, I passed them into this function:</p> <pre><code>private static void AddXMLStandalone(OpenXmlPart part) { System.IO.StreamWriter writer = new System.IO.StreamWriter(part.GetStream()); XmlDocument doc = new XmlDocument(); doc.Load(part.GetStream()); doc.InnerXml = doc.InnerXml.Substring(doc.InnerXml.IndexOf("?>") + 2); doc.InnerXml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" + doc.InnerXml; part.GetStream().SetLength(doc.InnerXml.Length); doc.Save(writer); writer.Flush(); writer.Close(); } </code></pre> <p>Good luck!</p>

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