c# Input array is longer than the number of columns in this table

Hi All,

I have an datatable that is filled from a quickbooks.  what i need to do next select the values by class name.  when trying this I get "Input array is longer than the number of columns in this table".  Below is my code

string selectrows = "ClassName = " + "'" + bobArray[i].ToString() + "'";
 for (int j = 0; j < dt_tr_classMerge.Columns.Count ; j++)
   {
                                        
       string colName = dt_tr_classMerge.Columns[j].ColumnName;
      dt_tr_class.Columns.Add(colName, typeof(String));
          }
          DataRow[] results = dt_tr_classMerge.Select(selectrows);
        dt_tr_class.Rows.Add(results);
         //dt_tr_classMerge.Select(selectrows);
         //
         //dt_tr_class.Rows.Add(dt_tr_classMerge.Select(selectrows));
     SaveReportDataToFile(dt_tr_class, tr_class, rp_path);

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I am not sure what I am doing wrong

Thank you for your help in advance