private void DropBtn_Click(object sender, RoutedEventArgs e)
{
//----------------------------------------
//logic for dropping a class from a student's schedule
//SQL logic removes the courseID and adds a position back to the class
if (dropChoice == null)
{
label3.Content = "Please select a valid course";
}
else if (studentChoice == null)
{
label3.Content = "Please select a student";
}
else if (studentChoice.getCurrentClass1() != "" && studentChoice.getCurrentClass2() != "" && studentChoice.getCurrentClass3() != "")
{
label3.Content = string.Format("Students can not register for more than 9 credit hours.");
}
else if (studentChoice.getCurrentClass1() == dropChoice.getCourseId())
{
dropclasslistbox.Items.Remove(dropChoice.getCourseId());
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass1 = '', creditcount = " + (studentChoice.getCreditHours() - 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("{0} successfully dropped", dropChoice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (dropChoice.getStudentsRegistered() + 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
studentChoice.setCurrentClass1("");
}
else if (studentChoice.getCurrentClass2() == dropChoice.getCourseId())
{
dropclasslistbox.Items.Remove(dropChoice.getCourseId());
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass2 = '', creditcount = " + (studentChoice.getCreditHours() - 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("{0} successfully dropped", dropChoice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (dropChoice.getStudentsRegistered() + 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
studentChoice.setCurrentClass2("");
}
else if (studentChoice.getCurrentClass3() == dropChoice.getCourseId())
{
dropclasslistbox.Items.Remove(dropChoice.getCourseId());
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass3 = '', creditcount = " + (studentChoice.getCreditHours() - 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("{0} successfully dropped", dropChoice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (dropChoice.getStudentsRegistered() + 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
studentChoice.setCurrentClass3("");
}
//resets the courses listed in the drop listbox
dropclasslistbox.Items.Clear();
dropclasslistbox.Items.Add(studentChoice.getCurrentClass1());
dropclasslistbox.Items.Add(studentChoice.getCurrentClass2());
dropclasslistbox.Items.Add(studentChoice.getCurrentClass3());
}
private void Acceptchangebtn_Click(object sender, RoutedEventArgs e)
{
//sends data in textboxes to SQL database
choice.setCourseId(courseidtxtbox.Text);
choice.setName(coursenametxtbox.Text);
choice.setCourseDesc(descriptiontxtbox.Text);
choice.setCreditHours(Convert.ToInt32(credithourstxtbox.Text));
choice.setClassSize(Convert.ToInt32(classsizetxtbox.Text));
choice.setStudentsRegistered(Convert.ToInt32(registeredtxtbox.Text));
SqlCommand courseUpdateQuery = new SqlCommand("UPDATE classes SET courseId = '" + choice.getCourseId() + "', name = '" + choice.getName() + "', credithours = " + choice.getCreditHours() + ", classSize = " + choice.getClassSize() + ", studentsRegistered = " + choice.getStudentsRegistered() + ", courseDescription = '" + choice.getCourseDesc() + "' WHERE courseId = '" + choice.getCourseId() + "'", clsDB.Get_DB_Connection());
courseUpdateQuery.ExecuteNonQuery();
clsDB.Close_DB_Connection();
MessageBox.Show(choice.getCourseId() + " was successfully updated.");
}
private void listbox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
foreach (Course course in courses)
{
if ((string)listBox.SelectedItem == course.getCourseId())
{
selectedCourse = course;
break;
}
}
}
//----------------------------------
//logic for registering a student for a class
//SQL logic for adding courseID to selected student
//SQL logic for updating the number of students registered in a course
private void AddBtn_Click(object sender, RoutedEventArgs e)
{
if (addChoice == null)
{
label3.Content = "Please select a valid course";
}
else if (studentChoice == null)
{
label3.Content = "Please select a student";
}
else if (studentChoice.getCurrentClass1() == addChoice.getCourseId() || studentChoice.getCurrentClass2() == addChoice.getCourseId() || studentChoice.getCurrentClass3() == addChoice.getCourseId())
{
label3.Content = string.Format("This student is already registered for {0}.", addChoice.getCourseId());
}
else if (studentChoice.getCurrentClass1() != "" && studentChoice.getCurrentClass2() != "" && studentChoice.getCurrentClass3() != "")
{
label3.Content = string.Format("Students can not register for more than 9 credit hours.");
}
else if (studentChoice.getCurrentClass1() == "")
{
dropclasslistbox.Items.Add(addChoice.getCourseId());
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass1 = '" + addChoice.getCourseId() + "', creditcount = " + (studentChoice.getCreditHours() + 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("Registration confirmed for course {0}", addChoice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (addChoice.getStudentsRegistered() - 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
studentChoice.setCurrentClass1(addChoice.getCourseId());
}
else if (studentChoice.getCurrentClass1() != "" && studentChoice.getCurrentClass2() == "")
{
dropclasslistbox.Items.Add(addChoice.getCourseId());
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass2 = '" + addChoice.getCourseId() + "', creditcount = " + (studentChoice.getCreditHours() + 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("Registration confirmed for course {0}", addChoice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (addChoice.getStudentsRegistered() - 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
studentChoice.setCurrentClass2(addChoice.getCourseId());
}
else if (studentChoice.getCurrentClass2() != "" && studentChoice.getCurrentClass3() == "")
{
dropclasslistbox.Items.Add(addChoice.getCourseId());
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass3 = '" + addChoice.getCourseId() + "', creditcount = " + (studentChoice.getCreditHours() + 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("Registration confirmed for course {0}", addChoice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (addChoice.getStudentsRegistered() - 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
studentChoice.setCurrentClass3(addChoice.getCourseId());
}
//resets listbox items
dropclasslistbox.Items.Clear();
dropclasslistbox.Items.Add(studentChoice.getCurrentClass1());
dropclasslistbox.Items.Add(studentChoice.getCurrentClass2());
dropclasslistbox.Items.Add(studentChoice.getCurrentClass3());
}
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
for (int i = 0; i < comboBox.Items.Count; i++)
{
if (courses[i].getCourseId() == (string)comboBox.Items.CurrentItem)
{
course = courses[i];
string courseIdSelected = courses[i].getCourseId();
Course currentSelection = courses[i];
string courseDesc = currentSelection.getCourseDesc();
this.courseIdtxtblk.Text = currentSelection.getCourseId();
this.coursedesctxtblk.Text = courseDesc;
this.seatsremainingtxtblk.Text = (currentSelection.getClassSize() - currentSelection.getStudentsRegistered()).ToString();
this.credithourstxtblk.Text = currentSelection.getCreditHours().ToString();
}
}
}
private void dropbutton_Click(object sender, RoutedEventArgs e)
{
//-----------------------------------------
//logic for dropping a class and SQL logic
//for removing the courseID from the student's schedule
listChoice = (string)listBox.SelectedItem;
if (listChoice == null || listChoice == "")
{
label3.Content = "Please select a class to drop.";
}
else if (student.getCurrentClass1() == selectedCourse.getCourseId())
{
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass1 = '', creditcount = " + (student.getCreditHours() - 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("{0} successfully dropped", selectedCourse.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (selectedCourse.getStudentsRegistered() + 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
student.setCurrentClass1("");
student.setCreditHours(student.getCreditHours() - 3);
}
else if (student.getCurrentClass2() == selectedCourse.getCourseId())
{
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass2 = '', creditcount = " + (student.getCreditHours() - 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("{0} successfully dropped", selectedCourse.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (selectedCourse.getStudentsRegistered() + 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
student.setCurrentClass2("");
student.setCreditHours(student.getCreditHours() - 3);
}
else if (student.getCurrentClass3() == selectedCourse.getCourseId())
{
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass3 = '', creditcount = " + (student.getCreditHours() - 3), clsDB.Get_DB_Connection());
updateStudentInfo.ExecuteNonQuery();
label3.Content = string.Format("{0} successfully dropped", selectedCourse.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (selectedCourse.getStudentsRegistered() + 1), clsDB.Get_DB_Connection());
updateClassNumber.ExecuteNonQuery();
student.setCurrentClass3("");
student.setCreditHours(student.getCreditHours() - 3);
}
listBox.Items.Clear();
listBox.Items.Add(student.getCurrentClass1());
listBox.Items.Add(student.getCurrentClass2());
listBox.Items.Add(student.getCurrentClass3());
textBox.Text = student.getCreditHours().ToString();
}
//------------------------------
//Logic in the event of registration button clicked
private void button_Click(object sender, RoutedEventArgs e)
{
listBox.Items.Clear();
courseIdChosen = (string)this.comboBox.SelectedItem;
for (int i = 0; i < courses.Count(); i++)
{
if (courses[i].getCourseId() == courseIdChosen)
{
choice = courses[i];
}
}
int totalCredits = Convert.ToInt32(textBox.Text);
//Display error message if no choice is selected
if (choice == null)
{
label3.Content = string.Format("Please choose a course to register for");
}
//Verification that student is able to register for selected class
else if (student.getCurrentClass1() == choice.getCourseId() || student.getCurrentClass2() == choice.getCourseId() || student.getCurrentClass3() == choice.getCourseId())
{
label3.Content = string.Format("You have alread registered for {0}.", choice.getCourseId());
}
else if (student.getCurrentClass1() != "" && student.getCurrentClass2() != "" && student.getCurrentClass3() != "")
{
label3.Content = string.Format("You can not register for more than 9 credit hours.");
}
else if (student.getCurrentClass1() == "")
{
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass1 = '" + choice.getCourseId() + "', creditcount = '" + (student.getCreditHours() + 3) + "' WHERE email = '" + studentEmail + "'", cn_connection);
updateStudentInfo.ExecuteNonQuery();
textBox.Text = Convert.ToString(student.getCreditHours());
label3.Content = string.Format("Registration confirmed for course {0}", choice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (course.getStudentsRegistered() + 1) + " WHERE courseId = '" + choice.getCourseId() + "'", cn_connection);
updateClassNumber.ExecuteNonQuery();
student.setCurrentClass1(choice.getCourseId());
student.setCreditHours(student.getCreditHours() + 3);
}
else if (student.getCurrentClass1() != "" && student.getCurrentClass2() == "")
{
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass2 = '" + choice.getCourseId() + "', creditcount = '" + (student.getCreditHours() + 3) + "' WHERE email = '" + studentEmail + "'", cn_connection);
updateStudentInfo.ExecuteNonQuery();
textBox.Text = Convert.ToString(student.getCreditHours());
label3.Content = string.Format("Registration confirmed for course {0}", choice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (course.getStudentsRegistered() + 1) + " WHERE courseId = '" + choice.getCourseId() + "'", cn_connection);
updateClassNumber.ExecuteNonQuery();
student.setCurrentClass2(choice.getCourseId());
student.setCreditHours(student.getCreditHours() + 3);
}
else if (student.getCurrentClass2() != "" && student.getCurrentClass3() == "")
{
SqlCommand updateStudentInfo = new SqlCommand("UPDATE student SET currentclass3 = '" + choice.getCourseId() + "', creditcount = '" + (student.getCreditHours() + 3) + "' WHERE email = '" + studentEmail + "'", cn_connection);
updateStudentInfo.ExecuteNonQuery();
textBox.Text = Convert.ToString(student.getCreditHours());
label3.Content = string.Format("Registration confirmed for course {0}", choice.getCourseId());
SqlCommand updateClassNumber = new SqlCommand("UPDATE classes SET studentsRegistered = " + (course.getStudentsRegistered() + 1) + " WHERE courseId = '" + choice.getCourseId() + "'", cn_connection);
updateClassNumber.ExecuteNonQuery();
student.setCurrentClass3(choice.getCourseId());
student.setCreditHours(student.getCreditHours() + 3);
}
listBox.Items.Add(student.getCurrentClass1());
listBox.Items.Add(student.getCurrentClass2());
listBox.Items.Add(student.getCurrentClass3());
textBox.Text = student.getCreditHours().ToString();
}