System.Data.DataTable.Clone C# (CSharp) Method

        public virtual DataTable Clone() => Clone(null);

        public static DataTable RemoveDuplicates(DataTable dt, DataColumn[] keyColumns, string SavePath, string currentMapping)
        {
            int rowNdx = 0;
            var res = new List<DataTable>();
            DataTable duplicatesTable = dt.Clone();

            var qFields = string.Join(", ", keyColumns.Select(x => "it[\"" + x.ColumnName + "\"] as " + x.ColumnName.Replace(" ","") + ""));

            var q = dt.AsEnumerable()
                                .AsQueryable()
                                .GroupBy("new(" + qFields + ")", "it")
                                .Select("new (it as Data)");

            var dtemp = dt.Clone();

            foreach (dynamic d in q)
            {
               // dtemp.Rows.Add(d.Data.First().ItemArray());
                rowNdx = 0;
                foreach (var row in d.Data)
                {
                    if (rowNdx == 0)
                    {
                        dtemp.Rows.Add(row.ItemArray);
                    }
                    else
                    {
                        duplicatesTable.Rows.Add(row.ItemArray);
                    }
                    rowNdx++;
                }
            }

            string newFileName = string.Format("{0}{1}", "test", rowNdx);
            FileSaveHelper.ExportDataTable(duplicatesTable, string.Format("{0}\\{1}", SavePath, currentMapping + "_Duplicates.xlsx"));
            return dtemp;
            //while (rowNdx < tbl.Rows.Count - 1)
            //{
            //    DataRow[] dups = FindDups(tbl, rowNdx, keyColumns);

            //    if (dups.Length > 0)
            //    {
            //        foreach (DataRow dup in dups)
            //        {
            //            duplicatesTable.ImportRow(dup);
            //            tbl.Rows.Remove(dup);
            //        }
            //        tbl.Rows.Add(dups.FirstOrDefault());
            //    }
            //    else
            //    {
            //        rowNdx++;
            //    }
            //}
               // return duplicatesTable;
        }