Error while calling an procedure using an external table with C#.

Question

Hello,
I am developping a scheduler application with Visual Studio 2010 (C#) to start my PL/SQL procedures.
Everything works fine with every procedure but one who is reading the content of an external table.
Strange thing is when i launch the same procedure with Toad, i have no problem, but when i launch it with my C# code :
            OracleCommand cmdMET = new OracleCommand();
            cmdMET.CommandText = "STG_AE.M_MET_S_EXT_DEFECT";
            cmdMET.CommandType = CommandType.StoredProcedure;
            cmdMET.Connection = con;
            //OracleParameter retvalMET = new OracleParameter("retval", OracleDbType.Varchar2, 50);
            //retvalMET.Direction = ParameterDirection.ReturnValue;
            //cmdMET.Parameters.Add(retvalMET);
            cmdMET.ExecuteNonQuery();
I've got this error :
ORA-29913: error in executing ODCIEXTTABLEFETCH callout
ORA-01722: invalid number
ORA-06512: at "STG_AE.M_MET_S_EXT_DEFECT", line 8
ORA-06512: at "STG_AE.MET_SRC", line 10
ORA-06512: at "STG_AE.MET", line 14
ORA-06512: at line 1
I can't figure out why it works when i launch it with Toad and why i get this error when launching it with C#... Any advice would be great !
Thanks!

Answer 1

You're right!
Adding
string sql = "ALTER SESSION SET NLS_NUMERIC_CHARACTERS = \",.\"";
OracleCommand cmd = new OracleCommand(sql, con);
cmd.CommandType = CommandType.Text;
OracleDataReader dr = cmd.ExecuteReader();
solved the problem !
Thanks a lot =)