Error de consulta SQL:la columna no puede ser nula

Del manual :

Usa esto:

string sql = "insert into testcase.ishan(nmae,orders) VALUES ('9', ?)";
OdbcCommand cmd = new OdbcCommand(sql, myConn); 
cmd.Parameters.AddWithValue("you_can_write_anything_here_its_ignored_anyway", S);  
cmd.ExecuteNonQuery();