New Post: Change header of table

Thank you very much for your answer. Unfortunately, it still does not work. I have illustrated an example:

 public class Test
 {
           public string Test1 { get; set; }
           public string Test2 { get; set; }
  }

public void MyTest()
{
            List<Test> testList = new List<Test>
            {
                new Test{Test1 = "T1",Test2 = "T2"},
                new Test{Test1 = "T1",Test2 = "T2"}
            };

            var wb1 = new XLWorkbook();
            var ws = wb1.Worksheets.Add("Mysheet");
            ws.Cell(1, 1).InsertTable(testList);
            wb1.SaveAs(@"C:\Test\Test1.xlsx");

            var wb2 = new XLWorkbook();
            var ws2 = wb2.Worksheets.Add("Mysheet");
            var tb2 = ws2.Cell(1, 1).InsertTable(testList);
            const string newHeader = "TestNew";
            for (int i = 0; i < tb2.Fields.Count(); i++)
            {
                tb2.Field(i).Name = string.Format("{0} {1}", newHeader, i);
            }
            wb2.SaveAs(@"C:\Test\Test2.xlsx");
}

File Test1.xlsx opens normally. Test2.xlsx opens after a repair process from excel. This is the message which excel provides:

<?xml version="1.0" encoding="UTF-8" standalone="true"?>

-<recoveryLog xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">

<logFileName>error195720_01.xml</logFileName>

<summary>Fehler in Datei 'C:\Test\Test2.xlsx'</summary>


-<repairedRecords summary="Die folgenden Reparaturen wurden durchgeführt:_x000d__x000a__x000d__x000a_">

<repairedRecord>Reparierte Datensätze: Tabelle von /xl/tables/table.xml-Part (Tabelle)</repairedRecord>

</repairedRecords>

</recoveryLog>

Are there some special characters which are not allowed? Or do you have any idea from where it comes?

Kind regards Alexander