>>>Joaquim,
>>>You could do that this way:
>>>

>>> string CRefeicao = "01", CFamiliaPrato = "02";
>>> string strFilter =
>>>    String.Format("CRefeicao = '{0}' and CFamiliaPrato = '{1}'",
>>>                  CRefeicao,
>>>                  CFamiliaPrato);
>>> foreach( DataRow row in Detalhe.Select( strFilter ) )
>>> {
>>>   row.Delete();
>>> }
>>>

>>>Cetin
>
>Don't you still have the problem with the indexer in this example also?

Which indexer problem? There weren't any indexer problem in the first place, I simply provided another way of filtering the rows to delete. Joaquim probably guided you wrong with the error message. "Delete" doesn't remove the row from the collection, thus no indexer problem there. Probably instead he tried to access to those deleted rows through DataRow which would error something like "...inaccessible...", not collection modified. ie:

using System;
using System.Data;
using System.Data.OleDb;

class test
{
 static void Main()
 {
   OleDbConnection con = new OleDbConnection(@"Provider=VFPOLEDB;
Data Source=C:\PROGRAM FILES\MICROSOFT VISUAL FOXPRO 9\SAMPLES\data\testdata.dbc");
   con.Open();
   OleDbCommand cmd = 
      new OleDbCommand("select cust_id,company,contact,country from customer",con);
   OleDbDataReader rdr = cmd.ExecuteReader();
   DataTable tbl = new DataTable();
   tbl.Load(rdr);
   con.Close();
   
   foreach(DataRow row in tbl.Rows)
   {
     if (((string)row["country"]).Trim() == "USA" || ((string)row["country"]).Trim() == "UK")  
         row.Delete();
   }

   for(int i=0;i<tbl.Rows.Count;i++)
   {
       if (tbl.Rows[i].RowState == DataRowState.Deleted )
        {
         Console.WriteLine("Row:{0},{1}",i,
           tbl.Rows[i].RowState);
        }
       else
       {
         Console.WriteLine("Row:{0},{1},{2}",i,
           tbl.Rows[i]["cust_id"],
           tbl.Rows[i]["country"]);
       }
   }
 }
}

Or:

   foreach(DataRow row in tbl.Rows)
   {
       if (row.RowState == DataRowState.Deleted )
        {
         Console.WriteLine("Row:{0}", row.RowState);
        }
       else
       {
         Console.WriteLine("Row:{0},{1}",
           row["cust_id"],
           row["country"]);
       }
   }

I think what he did was to query row["field"] for deleted ones too.
Cetin