EPPLUS names note saved

Jan 23 at 2:44 PM
I encountered a surprising problem with the Epplus Library. My concern is that when I rewrite to an existing (.xlsx) file, all of the namespaces are not typed. Example:
string ws_name = "name1”; 
ExcelWorksheet old = package.Workbook.Worksheets[ws_name];
package.Workbook.Worksheets.Delete(old);
newSheet = package.Workbook.Worksheets.Add(ws_name, package.Workbook.Worksheets["name2"]);
...
Package.Save(); 
The "name2" sheet contains name fields that are not written to newSheet. And my problem is there because I use them afterwards. Thank you in advance,