protected void btnSave_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//create new department in memory
Department dep = new Department();
//check url
if (!String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
dep = (from d in db.Departments
where d.DepartmentID == DepartmentID
select d).FirstOrDefault();
}
//fill new properties of the new department
dep.Name = txtName.Text;
dep.Budget = Convert.ToDecimal(txtBudget.Text);
//save the new department
if (String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
db.Departments.Add(dep);
}
db.Departments.Add(dep);
db.SaveChanges();
//redirect to department list page
Response.Redirect("departments.aspx");
}
}
protected void GetCourse()
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//get selected courseID from the url
Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
//query the db
Course objc = (from c in db.Courses
where c.CourseID == CourseID
select c).FirstOrDefault();
//populate the form
txtTitle.Text = objc.Title;
txtCredits.Text = objc.Credits.ToString();
ddlDepartment.SelectedValue = objc.DepartmentID.ToString();
//populate student enrollments grid
var Enrollments = from en in db.Enrollments
where en.CourseID == CourseID
orderby en.Student.LastName, en.Student.FirstMidName
select en;
//bind the grid
grdEnrollments.DataSource = Enrollments.ToList();
grdEnrollments.DataBind();
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
using (DefaultConnection db = new DefaultConnection())
{
Instructor objI = new Instructor();
objI.FirstName = txtFirstName.Text;
objI.LastName = txtLastName.Text;
objI.Username = txtUsername.Text;
objI.DepartmentID = Convert.ToInt32(ddlDepartment.SelectedValue);
String password = txtPassword.Text;
String salt = CreateSalt(8);
String pass_and_salt = password + salt;
// Create a new instance of the hash crypto service provider.
HashAlgorithm hashAlg = new SHA256CryptoServiceProvider();
// Convert the data to hash to an array of Bytes.
byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(pass_and_salt);
// Compute the Hash. This returns an array of Bytes.
byte[] bytHash = hashAlg.ComputeHash(bytValue);
// Optionally, represent the hash value as a base64-encoded string,
// For example, if you need to display the value or transmit it over a network.
string base64 = Convert.ToBase64String(bytHash);
objI.Password = base64;
objI.Salt = salt;
db.Instructors.Add(objI);
db.SaveChanges();
}
}
protected void GetStudent()
{
using (DefaultConnection db = new DefaultConnection())
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
Student stu = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
txtLastName.Text = stu.LastName;
txtFirstName.Text = stu.FirstMidName;
txtDate.Text = stu.EnrollmentDate.ToString("yyyy-MM-dd");
//populate student enrollments grid
var Enrollments = from e in db.Enrollments
where e.StudentID == StudentID
select e;
//bind to the grid
grdCourses.DataSource = Enrollments.ToList();
grdCourses.DataBind();
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
using (DefaultConnection db = new DefaultConnection())
{
Student stu = new Student();
Int32 StudentID = 0;
if (!String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
stu = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
}
stu.LastName = txtLastName.Text;
stu.FirstMidName = txtFirstName.Text;
stu.EnrollmentDate = Convert.ToDateTime(txtDate.Text);
if (StudentID == 0)
{
db.Students.Add(stu);
}
db.SaveChanges();
Response.Redirect("students.aspx");
}
}
protected void GetStudent()
{
//populate form with existing student record
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//connect to db via EF
using (DefaultConnection db = new DefaultConnection())
{
//populate a student instance with the StudentID from the URL parameter
Student s = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
//map the student properties to the form controls if we found a match
if (s != null) {
txtLastName.Text = s.LastName;
txtFirstMidName.Text = s.FirstMidName;
txtEnrollmentDate.Text = s.EnrollmentDate.ToString("yyyy-MM-dd");
}
var Enrolled = from c in db.Enrollments
where c.StudentID == StudentID
select c;
grdEnrolled.DataSource = Enrolled.ToList();
grdEnrolled.DataBind();
}
}
protected void GetCourses()
{
using (DefaultConnection db = new DefaultConnection())
{
var courses = from c in db.Courses
select c;
grdCourses.DataSource = courses.ToList();
grdCourses.DataBind();
}
}
protected void GetCourses()
{
using (DefaultConnection db = new DefaultConnection())
{
var cours = from d in db.Courses
select d;
//bind the cours query result to our grid
grdCourses.DataSource = cours.ToList();
grdCourses.DataBind();
}
}
protected void GetDepartments()
{
//use Entity Framework to connect and get the list of departments
using (DefaultConnection db = new DefaultConnection())
{
var deps = from d in db.Departments
select d;
//bind the deps query result to our grid
grdDepartments.DataSource = deps.ToList();
grdDepartments.DataBind();
}
}
protected void GetStudents()
{
//use entity framework to connect and get list of Departments
using (DefaultConnection db = new DefaultConnection())
{
var stud = from d in db.Students
select d;
//bind the stud query result to grid
grdStudents.DataSource = stud.ToList();
grdStudents.DataBind();
}
}
protected void GetStudents()
{
using (DefaultConnection db = new DefaultConnection())
{
var stu = from s in db.Students
select s;
grdStudents.DataSource = stu.ToList();
grdStudents.DataBind();
}
}
protected void GetCourses()
{
//connect to EF
using (DefaultConnection db = new DefaultConnection())
{
//query the courses table using EF and LINQ
var Courses = from c in db.Courses1
select c;
//bind the result to the gridview
grdCourses.DataSource = Courses.ToList();
grdCourses.DataBind();
}
}
protected void GetDepartment()
{
using (DefaultConnection db = new DefaultConnection())
{
var deps = from d in db.Departments
orderby d.Name
select d;
ddlDepartment.DataSource = deps.ToList();
ddlDepartment.DataBind();
ListItem default_item = new ListItem("select", "0");
ddlDepartment.Items.Insert(0, default_item);
}
}
protected void GetStudents()
{
//connect to EF
using (DefaultConnection db = new DefaultConnection())
{
//query the students table using EF and LINQ
var Students = from s in db.Students
select s;
//bind the result to the gridview
grdStudents.DataSource = Students.ToList();
grdStudents.DataBind();
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
using (DefaultConnection db = new DefaultConnection())
{
Student stu = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
db.Students.Remove(stu);
db.SaveChanges();
GetStudents();
}
}
protected void GetDepartment()
{
//look up the selected department and fill the form
using (DefaultConnection db = new DefaultConnection())
{
Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
//look up department
Department dep = (from d in db.Departments
where d.DepartmentID == DepartmentID
select d).FirstOrDefault();
//pre-populate the form fields
txtName.Text = dep.Name;
txtBudget.Text = dep.Budget.ToString();
}
}
protected void GetDepartments()
{
using (DefaultConnection db = new DefaultConnection())
{
var Departments = from d in db.Departments
orderby d.Name
select d;
//bind data dropdown list
ddlDepartment.DataSource = Departments.ToList();
ddlDepartment.DataBind();
//add a default option
ListItem DefaultItem = new ListItem("Select", "0");
ddlDepartment.Items.Insert(0, DefaultItem);
}
}
protected void GetDepartments()
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
// get the department list
var Departments = from d in db.Departments
orderby d.Name
select d;
//bind to the dropdown list
ddlDepartment.DataSource = Departments.ToList();
ddlDepartment.DataBind();
//add default option the to the dropdown after we fill it
ListItem DefaultItem = new ListItem("-Select-", "0");
ddlDepartment.Items.Insert(0, DefaultItem);
}
}
protected void grdDepartments_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//identify the departmentId to be deleted from the row the user selected
Int32 DepartmentID = Convert.ToInt32(grdDepartments.DataKeys[e.RowIndex].Values["DepartmentID"]);
//connect
using (DefaultConnection db = new DefaultConnection())
{
Department dep = (from d in db.Departments
where d.DepartmentID == DepartmentID
select d).FirstOrDefault();
//delete
db.Departments.Remove(dep);
db.SaveChanges();
//refresh grid
GetDepartments();
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//create a new department in memory
Department dep = new Department();
// op2 :Int32 DepartmentID = 0;
//check fot a url
if (!String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
// op2: DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
dep = (from d in db.Departments
where d.DepartmentID == DepartmentID
select d).FirstOrDefault();
}
//fill the property of the new department
dep.Name = txtname.Text;
dep.Budget = Convert.ToDecimal(txtBudget.Text);
//add if we have no id in the url
if (String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
db.Departments.Add(dep);
}
//op2: if(DepartmentID==0)
// save the new department
//excute the change commands
db.SaveChanges();
//redirect to the departments list page
Response.Redirect("departments.aspx");
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//identify the studentID to be deleted from the row the user selected
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
//connect to database
using (DefaultConnection db = new DefaultConnection())
{
Student stud = (from d in db.Students
where d.StudentID == StudentID
select d).FirstOrDefault();
//delete
db.Students.Remove(stud);
db.SaveChanges();
//refresh grid
GetStudents();
}
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
Int32 StudentID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["StudentID"]);
//use EF to remove the selected student from the db
using (DefaultConnection db = new DefaultConnection())
{
Student s = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
//do the delete
db.Students.Remove(s);
db.SaveChanges();
}
//refresh the grid
GetStudent();
}
protected void btnSave_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//create new course and fills the properties
Course objc = new Course();
objc.Title = txtTitle.Text;
objc.Credits = Convert.ToInt32(txtCredits.Text);
objc.DepartmentID = Convert.ToInt32(ddlDepartment.SelectedValue);
//save
db.Courses.Add(objc);
db.SaveChanges();
//redirect
Response.Redirect("courses.aspx");
}
}
protected void GetDepartments()
{
//use entity framework to connect and get the list of departments
using (DefaultConnection db = new DefaultConnection())
{
//old query that show all department
//var deps = from d in db.Departments
// select d;
//new query filtered for logged in user only
Int32 DepartmentID = Convert.ToInt32(Session["DepartmentID"]);
var deps = from d in db.Departments
where d.DepartmentID == DepartmentID
select d;
//bind the deps query result to our grid
grdDepartments.DataSource = deps.ToList();
grdDepartments.DataBind();
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
//connect db
using (DefaultConnection db = new DefaultConnection())
{
//create a new department in memory
Student stud = new Student();
Int32 StudentID = 0;
//check for a url
if (!String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
//get id from the url
StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//look up the student
stud = (from d in db.Students n
where d.StudentID == StudentID
select d).FirstOrDefault();
}
//fill properties of the new student
stud.FirstMidName = txtFirstName.Text;
stud.LastName = txtLastName.Text;
stud.EnrollmentDate = Convert.ToDateTime(txtEnrollDate.Text);
//add if we have no id in the url
if (StudentID == 0)
{
db.Students.Add(stud);
}
//save new student
db.SaveChanges();
//redirect to student list page
Response.Redirect("students.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
//use EF to connect to SQL Server
using (DefaultConnection db = new DefaultConnection())
{
//use the Student model to save the new record
Student s = new Student();
Int32 StudentID = 0;
//check the querystring for an id so we can determine add / update
if (Request.QueryString["StudentID"] != null)
{
//get the id from the url
StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//get the current student from EF
s = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
}
s.LastName = txtLastName.Text;
s.FirstMidName = txtFirstMidName.Text;
s.EnrollmentDate = Convert.ToDateTime(txtEnrollmentDate.Text);
//call add only if we have no student ID
if (StudentID == 0) {
db.Students.Add(s);
}
//run the update or insert
db.SaveChanges();
//redirect to the updated students page
Response.Redirect("students.aspx");
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//store which row was clicked
Int32 selectedRow = e.RowIndex;
//get the selected StudentID using the grid's Data Key collection
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[selectedRow].Values["StudentID"]);
//use EF to remove the selected student from the db
using (DefaultConnection db = new DefaultConnection()) {
Student s = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
//do the delete
db.Students.Remove(s);
db.SaveChanges();
}
//refresh the grid
GetStudents();
}
protected void GetStudent()
{
//store id from the url in a variable
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//look up selected student and fill the form
using (DefaultConnection db = new DefaultConnection())
{
//populate student instance
Student stud = (from d in db.Students
where d.StudentID == StudentID
select d).FirstOrDefault();
if(stud != null)
{
//pre-populate the form fields
txtFirstName.Text = stud.FirstMidName;
txtLastName.Text = stud.LastName;
txtEnrollDate.Text = stud.EnrollmentDate.ToString("yyyy-mm-dd");
}
//populate enrollments
var enroll = (from e in db.Enrollments
join c in db.Courses on e.CourseID equals c.CourseID
join d in db.Departments on c.DepartmentID equals d.DepartmentID
where e.StudentID == StudentID
select new { e.EnrollmentID, e.Grade, c.Title, d.Name });
grdCourses.DataSource = enroll.ToList();
grdCourses.DataBind();
//show course panel
pnlCourses.Visible = true;
}
}
