how to execute multiple oracle query c#

Question

i am trying to execute multiple oracle select query as explain at that post answer here but I am getting exception as show at image

the same way explained at oracle sit

Answer 1

Although you're using names for your parameters, your driver is treating them positionally. You can kind of tell because it's (almost) matching :1 with the name p_cr1 - '1' isn't a valid name. It doesn't complain since it matches positionally - but that means it's trying to use the P_para for :1, and as the type of that is wrong, that explains the error you see.

There may well be a way to change the driver's behaviour, but for now you can just swap the order you bind them - so the binds occur in the same order (position) the variables appear in the query. So:

cmd.Parameters.Add("p_cr1", OracleDbType.RefCursor, DBNull.Value, ParameterDirection.Output);
cmd.Parameters.Add(new OracleParameter(":P_para", OracleDbType.Int64)).Value = Convert.ToInt64(Textbox.Text);
cmd.Parameters.Add("p_cr2", OracleDbType.RefCursor, DBNull.Value, ParameterDirection.Output);