//------------------------------
//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();
}