Import matched Columns from DataDable using C# in ASP.Net

have created 2 data table  1) ImportExcelDT  2) ExportExcelDT 

then i am checking if there is row  and validating every columns of it 

int Col = 0;
            using (OleDbDataAdapter oda = new OleDbDataAdapter("SELECT * FROM [" + sheet1 + "]", excel_con))
            {
                oda.Fill(ImportExcelDT);

                if (ImportExcelDT.Rows.Count > 0)
                {
                    for (int i = 0; i < ImportExcelDT.Rows.Count; i++)
                    {

                        string EmpCod = ImportExcelDT.Rows[i]["Employee Code"].ToString();
                        bool isEmpCod = Regex.IsMatch(EmpCod, @"^[a-zA-Z0-9/-]+$");

                       //Here i am checking condition if its false
                       if (!isEmpCod)
                        {
                            count++;
                          //Now i want to copy and delete selected row in another data table 
                            for (int j = 0; j < ImportExcelDT.Rows.Count; j++)
                            {
                                ImportExcelDT.Rows[j][i] = ExportExcelDT.Rows[j][Col];
                                ImportExcelDT.Rows[i].Delete();

                            }
                        }
                        else
                        {

                        }

am bit confused on which columns should i select on ImportExcelDT.Rows[j][i] and ExportExcelDT.Rows[j][Col]; while copying  Any suggestion are welcome