OleDbCommand with Update $OleDbParameter: why parameters should be in same order as sql ?

Question

            OleDbCommand cmd = new OleDbCommand("UPDATE mytable SET " + "col2=@col2 WHERE col1=@col1", connection);

            cmd.Parameters.Add(new OleDbParameter("@col1", "col1"));
            cmd.Parameters.Add(new OleDbParameter("@col2", "col2"));

won't work because it should be

            cmd.Parameters.Add(new OleDbParameter("@col2", "col2"));
            cmd.Parameters.Add(new OleDbParameter("@col1", "col1"));

Why name the parameters if it depends on the order ? and why ado.net doen't even fire any error ?