private void btnAddIncident_Click(object sender, EventArgs e)
        {
            String givenName = tBStudentGN.Text;
            String sureName = tBStudentSN.Text;
            Student currentStudent;
            Class currentClass;
            Teacher currentTeacher;

            try
            {
                currentStudent = UtilityDB.getStudent(givenName, sureName);
                currentClass = UtilityDB.getClass(currentStudent.class_ID);
                currentTeacher = UtilityDB.getTeacher(currentClass.teacher_ID);               
            }
            catch (Exception)
            {
                // Fehlerhafte Eingabe. 
                currentTeacher = new Teacher(0, "", "nicht", "gefunden", "nope");
                currentClass = new Class(0, 0, "nicht gefunden");
            }

            lBClassFilled.Text = currentClass.className;
            lbTeacherFilled.Text = currentTeacher.givenName + "  " + currentTeacher.surname;


                      
        }
 /// <summary>
 /// Gets a teacher object by className.
 /// </summary>
 /// <param name="className">The name of the class.</param>
 /// <returns>Returns a teacher object or null</returns>
 public static Teacher getClassTeacher(String className)
 {
     try
     {
         Class c = getClass(className);
         openconnection();
         cmd = new OleDbCommand("SELECT * FROM Teacher WHERE Teacher_ID = " + c.teacher_ID, connection);
         dr = cmd.ExecuteReader();
         dr.Read();
         String title = dr[1].ToString();
         String givenName = dr[2].ToString();
         String surname = dr[3].ToString();
         String initials = dr[4].ToString();
         Teacher t = new Teacher(c.teacher_ID, title, givenName, surname, initials);
         closeconnection();
         return t;
     }
     catch
     {
         return null;
     }
 }
 /// <summary>
 /// Gets a teacher objectby the full name.
 /// </summary>
 /// <param name="givenName">The given Name of the teacher.</param>
 /// <param name="surname">The Surname of the teacher.</param>
 /// <returns>Returns a teacher object or null</returns>
 public static Teacher getTeacher(String givenName, String surname)
 {
     try
     {
         openconnection();
         cmd = new OleDbCommand("SELECT * FROM Teacher WHERE GivenName =@givenName AND surname =@surname ", connection);
         cmd.Parameters.AddWithValue("@givenName", givenName);
         cmd.Parameters.AddWithValue("@surname", surname);
         dr = cmd.ExecuteReader();
         dr.Read();
         int teacherID = Convert.ToInt32(dr[0].ToString());
         String title = dr[1].ToString();
         givenName = dr[2].ToString();
         surname = dr[3].ToString();
         String initials = dr[4].ToString();
         Teacher t = new Teacher(teacherID, title, givenName, surname, initials);
         closeconnection();
         return t;
     }
     catch
     {
         return null;
     }
 }