protected void btnSave_Click(object sender, EventArgs e)
{
try
{
using (comp2007Entities db = new comp2007Entities())
{
Course c = new Course();
Int32 CourseID = 0;
if (Request.QueryString["CourseID"] != null)
{
CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
c = (from objD in db.Courses where objD.CourseID == CourseID select objD).FirstOrDefault();
}
c.Title = txtTitle.Text;
c.Credits = Convert.ToInt32(txtCredits.Text);
c.DepartmentID = Convert.ToInt32(ddlCourses.SelectedValue);
if (CourseID == 0)
{
db.Courses.Add(c);
}
db.SaveChanges();
Response.Redirect("courses.aspx");
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void GetCourse()
{
try
{
Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
using (comp2007Entities db = new comp2007Entities())
{
Course c = (from ObjD in db.Courses where ObjD.CourseID == CourseID select ObjD).FirstOrDefault();
if (c != null)
{
txtTitle.Text = c.Title;
txtCredits.Text = c.Credits.ToString();
ddlCourses.SelectedValue = c.DepartmentID.ToString();
pnlStudents.Visible = true;
}
var objE = (from en in db.Enrollments
join s in db.Students on en.StudentID equals s.StudentID
where c.CourseID == en.CourseID
select new { s.StudentID, s.FirstMidName, s.LastName });
grdStudents.DataSource = objE.ToList();
grdStudents.DataBind();
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void GetStudent()
{
try
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
using (comp2007Entities db = new comp2007Entities())
{
Student s = (from ObjS in db.Students where ObjS.StudentID == StudentID select ObjS).FirstOrDefault();
if (s != null)
{
txtLastName.Text = s.LastName;
txtFirstName.Text = s.FirstMidName;
txtEnrollmentDate.Text = s.EnrollmentDate.ToString("yyyy-MM-dd");
pnlStudents.Visible = true;
}
var objE = (from en in db.Enrollments
join c in db.Courses on en.CourseID equals c.CourseID
join d in db.Departments on c.DepartmentID equals d.DepartmentID
where en.StudentID == s.StudentID
select new { en.EnrollmentID, en.Grade, c.Title, d.Name });
grdEnrollment.DataSource = objE.ToList();
grdEnrollment.DataBind();
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void GetDepartments()
{
try {
using (comp2007Entities db = new comp2007Entities())
{
String SortString = Session["SortColumn"].ToString() + " " + Session["SortDirection"].ToString();
var Departments = from d in db.Departments
select d;
grdDepartments.DataSource = Departments.AsQueryable().OrderBy(SortString).ToList();
grdDepartments.DataBind();
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void GetCourses()
{
try {
using (comp2007Entities db = new comp2007Entities())
{
String SortString = Session["SortColumn"].ToString() + " " + Session["SortDirection"].ToString();
var Courses = from c in db.Courses
select new { c.CourseID, c.Title, c.Credits, c.Department.Name };
grdCourses.DataSource = Courses.AsQueryable().OrderBy(SortString).ToList();
grdCourses.DataBind();
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
using (comp2007Entities db = new comp2007Entities())
{
Student s = new Student();
Int32 StudentID = 0;
if (Request.QueryString["StudentID"] != null)
{
StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
s = (from objS in db.Students where objS.StudentID == StudentID select objS).FirstOrDefault();
}
s.LastName = txtLastName.Text;
s.FirstMidName = txtFirstName.Text;
s.EnrollmentDate = Convert.ToDateTime(txtEnrollmentDate.Text);
Enrollment en = new Enrollment();
en.CourseID = Convert.ToInt32(ddlCourses.SelectedValue);
en.StudentID = s.StudentID;
if (StudentID == 0)
{
db.Students.Add(s);
db.Enrollments.Add(en);
}
db.SaveChanges();
Response.Redirect("students.aspx");
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void grdDepartments_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try {
Int32 selectedRow = e.RowIndex;
Int32 DepartmentID = Convert.ToInt32(grdDepartments.DataKeys[selectedRow].Values["DepartmentID"]);
using (comp2007Entities db = new comp2007Entities())
{
Department d = (from objD in db.Departments where objD.DepartmentID == DepartmentID select objD).FirstOrDefault();
db.Departments.Remove(d);
db.SaveChanges();
}
GetDepartments();
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try {
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
using (comp2007Entities db = new comp2007Entities())
{
Student s = (from objS in db.Students where objS.StudentID == StudentID select objS).FirstOrDefault();
db.Students.Remove(s);
db.SaveChanges();
}
GetCourse();
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void Page_Load(object sender, EventArgs e)
{
try
{
if (!IsPostBack)
{
using (comp2007Entities db = new comp2007Entities())
{
foreach (Department d in db.Departments)
{
ddlCourses.Items.Add(new ListItem(d.Name, d.DepartmentID.ToString()));
}
// foreach (Student s in db.Students)
// {
// ddlAddStudents.Items.Add(new ListItem(s.FirstMidName, s.StudentID.ToString()));
// }
}
if (Request.QueryString.Count > 0)
{
GetCourse();
}
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try {
Int32 selectedRow = e.RowIndex;
Int32 CourseID = Convert.ToInt32(grdCourses.DataKeys[selectedRow].Values["CourseID"]);
using (comp2007Entities db = new comp2007Entities())
{
Course c = (from objC in db.Courses where objC.CourseID == CourseID select objC).FirstOrDefault();
db.Courses.Remove(c);
db.SaveChanges();
}
GetCourses();
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void grdEnrollment_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try
{
Int32 EnrollmentID = Convert.ToInt32(grdEnrollment.DataKeys[e.RowIndex].Values["EnrollmentID"]);
using (comp2007Entities db = new comp2007Entities())
{
Enrollment en = (from objE in db.Enrollments where objE.EnrollmentID == EnrollmentID select objE).FirstOrDefault();
db.Enrollments.Remove(en);
db.SaveChanges();
}
GetStudent();
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
protected void Page_Load(object sender, EventArgs e)
{
try
{
if (!IsPostBack)
{
using (comp2007Entities db = new comp2007Entities())
{
foreach (Course c in db.Courses)
{
ddlCourses.Items.Add(new ListItem(c.Title, c.CourseID.ToString()));
}
}
if (Request.QueryString.Count > 0)
{
GetStudent();
}
}
}
catch (Exception ex)
{
Response.Redirect("/error.aspx");
}
}
