ORA-00936: missing expression when reading from database with dotConnect driver and oracle database

I am using dotConnect driver for connecting to oracle database but i always get this error when i want to use parameters: ORA-00936: missing expression

CODE:

using (var cmd = conn.CreateCommand())
            {
                conn.Open();
                cmd.CommandText = "SELECT stevilka_dokumenta from zmpt_dokumenti_po where status = @status"; ;
                cmd.Parameters.Add("@status", OracleDbType.VarChar, "1");

                using (var reader = cmd.ExecuteReader())
                {
       开发者_Python百科             while (reader.Read())
                    {
                        string stevilkaDokumenta = reader.GetString("stevilka_dokumenta");
                    }
                }

Error is here:

using (var reader = cmd.ExecuteReader())

why i get ORA-00936: missing expression? How must i declare input parameters?

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just try changing @status to :status.

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Also, to those still having issues, make sure you don't include a Semicolon at the end...