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In my opinion you would have to rename second “Dönem” column after reading DT2, due to fact that you can not have two columns with the same name. So after renaming you can have: “Dönem” and "Dönem_2. Later, you can rename column in an excel file.
It was happening before but when I added the following codes it stopped happening
(StatusDT.Rows(0).ItemArray(2).ToString+“,”+String.Join(“,”,StatusDT.Rows(0).ItemArray.Skip(4))).Split(“,”)
(StatusDT.Rows(1).ItemArray(2).ToString+“,”+String.Join(“,”,String.Join(“,“c,StatusDT.Rows(1).ItemArray).Split(CChar(”,”)).Skip(4).ToList)).Split(“,”).tolIst