protected void saveButton_Click(object sender, EventArgs e)
{
Student aStudent = new Student();
aStudent.name = nameTextBox.Text;
aStudent.email = emailTextBox.Text;
aStudent.regNo = regNoTextBox.Text;
if (ViewState["student"] != null)
{
List<Student> studentList = (List < Student >) ViewState["student"];
if (studentList.Count < 3)
{
studentList.Add(aStudent);
}
else
{
Response.Write("3 student already exists<br/><br/>");
}
}
else
{
List<Student> list = new List<Student>();
list.Add(aStudent);
ViewState["student"] = list;
}
}
//------------------------------------------------------------------------------------
//Procedure: AddStudent
//Purpose: Provides core functionality for adding a student record
// Used by Insert button.
//Accepts: NA
//Returns: NA
private void AddStudent()
{
Student newStudent = new Student();
newStudent.ID = Int32.Parse(txtStudentID.Text.Trim());
newStudent.Name = txtStudentName.Text;
newStudent.Department = txtDepartment.Text;
newStudent.Major = txtMajor.Text;
newStudent.Semester = Int32.Parse(txtSemester.Text.Trim());
aStudents.Add(newStudent);
}
static void Main(string[] args)
{
Student firstStudentObject = new Student();
firstStudentObject.StudentLastName = AskForStudentName("Last");
firstStudentObject.StudentFirstName = AskForStudentName("First");
firstStudentObject.StudentNumber = AskForStudentNumber();
firstStudentObject.Major = AskForMajor(firstStudentObject.StudentFirstName);
firstStudentObject.Score1 = AskForExamScore(1);
firstStudentObject.Score2 = AskForExamScore(2);
firstStudentObject.Score3 = AskForExamScore(3);
Console.Clear();
Console.WriteLine("First Student");
Console.WriteLine(firstStudentObject.ToString());
Student secondStudentObject = new Student("2345");
secondStudentObject.Score1 = 95;
secondStudentObject.Score2 = 62;
secondStudentObject.Score3 = 87;
Console.WriteLine("\n\nSecond Student");
Console.WriteLine("Student Number: " + secondStudentObject.StudentNumber +
"\nAverage: {0:F1}", secondStudentObject.CalculateAverage());
Student thirdStudentObject = new Student("5432", "Randolph", "Wonder");
thirdStudentObject.Major = "Math";
thirdStudentObject.Score1 = 95;
thirdStudentObject.Score2 = 87;
thirdStudentObject.Score3 = 72;
Console.WriteLine("\n\nThird Student");
Console.WriteLine(thirdStudentObject);
Student aStudentObject = new Student("1234", "Maria", "Smith", 97, 75, 87, "CS");
Console.WriteLine("\n\nLast Student");
Console.WriteLine("Student Name: " + aStudentObject.StudentFirstName +
" " + aStudentObject.StudentLastName +
"\nStudent Number: " + aStudentObject.StudentNumber +
"\nMajor: " + aStudentObject.Major +
"\nExam Score 1: " + aStudentObject.Score1 +
"\nExam Score 2: " + aStudentObject.Score2 +
"\nExam Score 3: " + aStudentObject.Score3 +
"\nExam Average: " + aStudentObject.CalculateAverage().ToString("F1"));
Console.ReadKey();
}
//------------------------------------------------------------------------------------
//Procedure: UpdateStudent
//Purpose: Provides core functionality for updating a student record
// Used by Insert and Update buttons.
//Accepts: ref Student objStudent: student record to update
//Returns: NA
private void UpdateStudent(ref Student objStudent)
{
objStudent.Name = txtStudentName.Text;
objStudent.Department = txtDepartment.Text;
objStudent.Major = txtMajor.Text;
objStudent.Semester = Int32.Parse(txtSemester.Text.Trim());
}
//------------------------------------------------------------------------------------
//Procedure: GetCurrentStudent
//Purpose: Gets the student record for the currently entered ID
// Used by Search, Next and Previous buttons.
//Accepts: out Student objStudent: Student object that was found
//Returns: True if success, False if not
private Boolean GetCurrentStudent(out Student objStudent)
{
if (ValidateID(txtStudentID.Text) == true)
{
if (FindStudent(txtStudentID.Text, out objStudent) == true)
{
return true;
}
else
{
MessageBox.Show(this, String.Format("An existing student record was not found for ID: {0}", txtStudentID.Text),"Student Not Found", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return false;
}
}
else
{
objStudent = null;
return false;
}
}
//------------------------------------------------------------------------------------
//Procedure: FindStudent
//Purpose: Provides core functionality for finding a student record
// Used by Insert, Update, Delete and Search buttons.
//Accepts: string strID: ID of student record to find
// out Student objStudent: Student object that was found
//Returns: True if Student was found, False if not
private Boolean FindStudent(string strID, out Student objStudent)
{
int intID;
intID = Int32.Parse(strID.Trim());
foreach (Student s in aStudents)
{
if (s.ID == intID)
{
objStudent = s;
return true;
}
}
objStudent = null;
return false;
}
//------------------------------------------------------------------------------------
//Procedure: DisplayStudent
//Purpose: Provides core functionality for displaying a student record
// Used by Search, Next and Previous buttons.
//Accepts: ref Student objStudent: student record to update
//Returns: NA
private void DisplayStudent(ref Student objStudent)
{
txtStudentID.Text = objStudent.ID.ToString();
txtStudentName.Text = objStudent.Name;
txtDepartment.Text = objStudent.Department;
txtMajor.Text = objStudent.Major;
txtSemester.Text = objStudent.Semester.ToString();
}
//------------------------------------------------------------------------------------
//Procedure: DeleteStudent
//Purpose: Deletes a student record
// Used by Delete button.
//Accepts: ref Student objStudent: student record to delete
//Returns: NA
private void DeleteStudent(ref Student objStudent)
{
aStudents.Remove(objStudent);
}
private void btnPrevious_Click(object sender, EventArgs e)
{
Student objStudent;
Student previousStudent;
int intPreviousIndex;
if (GetCurrentStudent(out objStudent))
{
intPreviousIndex = aStudents.IndexOf(objStudent);
intPreviousIndex--;
//Check if index is before BOF
if (intPreviousIndex < 0)
{
//just display the current record
DisplayStudent(ref objStudent);
MessageBox.Show(this, "The beginning of the file has been reached.", "BOF Reached", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
//Display the previous record
previousStudent = new Student();
previousStudent = (Student)aStudents[intPreviousIndex];
DisplayStudent(ref previousStudent);
}
}
}
private void btnNext_Click(object sender, EventArgs e)
{
Student objStudent;
Student nextStudent;
int intNextIndex;
if (GetCurrentStudent(out objStudent))
{
intNextIndex = aStudents.IndexOf(objStudent);
intNextIndex++;
//Check if index is past EOF
if (intNextIndex > (aStudents.Count - 1))
{
//just display the current record
DisplayStudent(ref objStudent);
MessageBox.Show(this, "The end of the file has been reached.", "EOF Reached", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
//Display the next record
nextStudent = new Student();
nextStudent = (Student)aStudents[intNextIndex];
DisplayStudent(ref nextStudent);
}
}
}
static void Main()
{
// Create a student object, populating its StudentFirstName, StudentLastName, and StudentNumber properties from static prompt methods of StudentApp class.
Student firstStudentObject = new Student
{
StudentFirstName = AskForStudentName("First"),
StudentLastName = AskForStudentName("Last"),
StudentNumber = AskForStudentNumber()
};
firstStudentObject.Major = AskForMajor(firstStudentObject.StudentFirstName);
firstStudentObject.Score1 = AskForExamScore(1);
firstStudentObject.Score2 = AskForExamScore(2);
firstStudentObject.Score3 = AskForExamScore(3);
// Working with added property.
while (true)
{
WriteLine("Enter your expected date of graduation");
string graduationDateString = ReadLine();
if (DateTime.TryParse(graduationDateString, out DateTime graduationDate))
{
firstStudentObject.GraduationDate = graduationDate;
break;
}
else
{
WriteLine("You must enter a valid month, day, and year. Try again");
}
}
// Clear the screen
Clear();
// Using the override of the ToString() method, write a student's information.
WriteLine("First Student");
WriteLine(firstStudentObject.ToString());
// Create a second student object using one-argument constructor.
Student secondStudentObject = new Student("2345")
{
Score1 = 95,
Score2 = 62,
Score3 = 87
};
// Use the Console.WriteLine method, concatenation, and the second student's ID number and average to one decimal point into a string displayed on the console."
WriteLine("\n\nSecond Student");
WriteLine("Student Number: " + secondStudentObject.StudentNumber +
"\nAverage: {0:F1}", secondStudentObject.CalculateAverage());
// Create a third object using three-argument constructor.
Student thirdStudentObject = new Student("5432", "Randolph", "Wonder")
{
Major = "Math",
Score1 = 95,
Score2 = 87,
Score3 = 72
};
WriteLine("\n\nThird Student");
WriteLine(thirdStudentObject);
// Create an object using a seven-argument constructor, then write each of its properties to the console using string concatenation.
Student aStudentObject = new Student("1234", "Maria", "Smith", 97, 75, 87, "CS");
WriteLine("\n\nLast Student");
WriteLine("Student Name: " + aStudentObject.StudentFirstName +
" " + aStudentObject.StudentLastName +
"\nStudent Number: " + aStudentObject.StudentNumber +
"\nMajor: " + aStudentObject.Major +
"\nExam Score 1: " + aStudentObject.Score1 +
"\nExam Score 2: " + aStudentObject.Score2 +
"\nExam Score 3: " + aStudentObject.Score3 +
"\nExam Average: " + aStudentObject.CalculateAverage().ToString("F1"));
ReadKey();
}
public void AddStudents(Student student)
{
_studentList.Add(student);
Save();
}
