sql

Hi,
I am trying to insert from this GUI:http://people.clarkson.edu/~havenssm/gui5.doc
by pressing *Add new Student* button. i was able to print the last and first names of the student
 entered on GUI, why this error?


===============Error message ===============
sLast:myLast
sFirst:myFirst
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 2.
          at sss.StudentSupportServices$AddStudent.actionPerformed(StudentSupportServices.java:450)

   
       //================ 1.) process student ====================
       
            String sLast = student.getLast();
            String sFirst = student.getFirst();
            String sNum = student.getStudentNum();
            String sPhone = student.getPhoneNum();
            String sBox = student.getBoxNum();
            String sAccom = student.getAccom();
            try {    
                 stm = accessCon.createStatement();  
                // Disable auto commit
                accessCon.setAutoCommit(false);
               
            String addStudentSql ="INSERT INTO Student" +
              " ([Last Name], [First Name], [Student Number],[Box #]," +
              " [Student Phone]" +
              ") VALUES " +
              "('" + sLast + "','" + sFirst + "','" +
              sNum + "','" + sBox + "','" + sAccom +"');";
           
            System.out.println("sLast:" +sLast);
            System.out.println("sFirst:" +sFirst);
           
            String selectStudentSql = "SELECT " +
            "StudentID, [First Name], [Last Name] FROM Student " +
            "WHERE [Last Name]= "
            + sLast + " AND [First Name] = "+ sFirst +";";
           
            rs = stm.executeQuery( selectStudentSql );  <<<<<<======Line 450