protected void GetStudent()
{
try {
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
using (DefaultConnection db = new DefaultConnection())
{
Student stu = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
if (stu != null)
{
txtName.Text = stu.LastName;
txtFirstName.Text = stu.FirstMidName;
txtEnrollmentDate.Text = stu.EnrollmentDate.ToString("yyyy-MM-dd");
}
var Courses = from c in db.Enrollments
where c.StudentID == StudentID
select c;
grdCoursesEnrolled.DataSource = Courses.ToList();
grdCoursesEnrolled.DataBind();
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void GetCourse()
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//Get the 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 to the grid
grdEnrollments.DataSource = Enrollments.ToList();
grdEnrollments.DataBind();
}
}
protected void GetDepartment()
{
try
{
// look up the selected department and fill the form
using (DefaultConnection db = new DefaultConnection())
{
// store the id from url in variable
Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
// look up the department
Department dep = (from d in db.Departments
where d.DepartmentID == DepartmentID
select d).FirstOrDefault();
// prepoulate form fields
txtName.Text = dep.Name;
txtBudget.Text = Convert.ToString(dep.Budget);
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void GetDepartments()
{
try {
// use entity framework to connect and get the list of departments
using (DefaultConnection db = new DefaultConnection())
{
////oold query that shows all departments
//var deps = from d in db.Departments
// select d;
// new query filer for logged in user
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();
}
}
catch {
Response.Redirect("error.aspx");
}
}
protected void GetCourse()
{
try
{
using (DefaultConnection db = new DefaultConnection())
{
Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
Course objc = (from c in db.Courses
where c.CourseID == CourseID
select c).FirstOrDefault();
txtTitle.Text = objc.Title;
txtCredits.Text = objc.Credits.ToString();
ddlDepartments.SelectedValue = objc.DepartmentID.ToString();
//populate student enrollments grid
var Enrollments = from en in db.Enrollments
where en.CourseID == CourseID
orderby en.Student.LastName
select en;
grdEnrollments.DataSource = Enrollments.ToList();
grdEnrollments.DataBind();
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
// identify the department id to be deleted from the row the user selected
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
try
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
Student stud = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
// delete
db.Students.Remove(stud);
db.SaveChanges();
//refresh the grid
GetStudents();
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
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 btnLogin_Click(object sender, EventArgs e)
{
using (DefaultConnection db = new DefaultConnection())
{
Instructor objc = new Instructor();
String username = txtUserName.Text;
objc = (from i in db.Instructors
where i.Username == username
select i).FirstOrDefault();
if (objc != null)
{
String salt = objc.Salt;
//salt and hash password
String password = txtPassword.Text;
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);
// cehck if matches password in db
if (objc.Password == base64)
{
lblError.Text = "Valid login";
// store session variable
Session["InstructorID"] = objc.InstructorID;
Session["InstructorName"] = objc.FirstName + " " + objc.LastName;
Session["DepartmentID"] = objc.DepartmentID;
Response.Redirect("departments.aspx");
}
}
else
{
lblError.Text = "invalid login";
}
}
}
protected void GetEnrolledCourses()
{
using (DefaultConnection db = new DefaultConnection())
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//Courses objc = (from s in db.Students
// where s.StudentID == StudentID
// select s).FirstOrDefault();
//txtTitle.Text = objc.Title;
//txtCredits.Text = objc.Credits.ToString();
//ddlDepartments.SelectedValue = objc.DepartmentID.ToString();
}
}
protected void GetStudents()
{
//try
//{
//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 GetDepartment()
{
//look up the selected department and fill the form
using (DefaultConnection db = new DefaultConnection())
{
//store the id from the url in a variable
Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
//look up the 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()
{
//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 a default option to the dropdown after we fill it
ListItem DefaultItem = new ListItem("-Select-", "0");
ddlDepartment.Items.Insert(0, DefaultItem);
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
// connect
using (DefaultConnection db = new DefaultConnection())
{
// create a new department in memory
Department dep = new Department();
//check for url
if (!String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
// get ud from url
Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
dep = (from d in db.Departments
where d.DepartmentID == DepartmentID
select d).FirstOrDefault();
}
// fill the properties of the new department
dep.Name = txtName.Text;
dep.Budget = Convert.ToDecimal(txtBudget.Text);
// add the new department if no url
if (String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
db.Departments.Add(dep);
db.SaveChanges();
}
// save new department
db.SaveChanges();
//redirect
Response.Redirect("departments.aspx");
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
using (DefaultConnection db = new DefaultConnection())
{
Student stud = new Student();
if (!String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
stud = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
}
stud.LastName = txtName.Text;
stud.FirstMidName = txtFirstName.Text;
stud.EnrollmentDate = Convert.ToDateTime(txtEnrollmentDate.Text);
// add the new department if no url
if (String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
db.Students.Add(stud);
db.SaveChanges();
}
// save new department
db.SaveChanges();
//redirect
Response.Redirect("students.aspx");
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void GetCourses()
{
try
{
// use entity framework to connect and get the list of departments
using (DefaultConnection db = new DefaultConnection())
{
var cours = from c in db.Courses
select c;
// bind the deps query result to our grid
grdCourses.DataSource = cours.ToList();
grdCourses.DataBind();
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void btnRegister_Click(object sender, EventArgs e)
{
try
{
using (DefaultConnection db = new DefaultConnection())
{
Instructor objc = new Instructor();
objc.FirstName = txtFirstName.Text;
objc.LastName = txtLastName.Text;
objc.Username = txtUserName.Text;
objc.DepartmentID = Convert.ToInt32(ddlDepartments.SelectedValue);
//salt and hash password
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);
objc.Password = base64;
objc.Salt = salt;
db.Instructors.Add(objc);
db.SaveChanges();
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void GetDepartments()
{
//use Entity Framework to connect and get the list of Departments
using (DefaultConnection db = new DefaultConnection())
{
//old query that shows all departments
//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
using (DefaultConnection db = new DefaultConnection())
{
//create a new course and fill 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 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 GetDepartments()
{
try {
using (DefaultConnection db = new DefaultConnection())
{
var deps = from d in db.Departments
orderby d.Name
select d;
ddlDepartments.DataSource = deps.ToList();
ddlDepartments.DataBind();
ListItem DefaultItem = new ListItem("-Select-", "0");
ddlDepartments.Items.Insert(0, DefaultItem);
}
}
catch
{
Response.Redirect("~/error.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 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");
}
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//create a new department in memory
Department dep = new Department();
Int32 DepartmentID = 0;
//check for a url
if (!String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
//get the id from the url
DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
//look up the department
dep = (from d in db.Departments
where d.DepartmentID == DepartmentID
select d).FirstOrDefault();
}
//fill the properties of the new department
dep.Name = txtName.Text;
dep.Budget = Convert.ToDecimal(txtBudget.Text);
//add if we have no id in the url
if (DepartmentID == 0)
{
db.Departments.Add(dep);
}
//save the new department
db.SaveChanges();
//redirect to the departments list page
Response.Redirect("departments.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
using (DefaultConnection db = new DefaultConnection())
{
Course objc = new Course();
objc.Title = txtTitle.Text;
objc.Credits = Convert.ToInt32(txtCredits.Text);
objc.DepartmentID = Convert.ToInt32(ddlDepartments.SelectedValue);
db.Courses.Add(objc);
db.SaveChanges();
Response.Redirect("courses.aspx");
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
protected void GetStudents()
{
// use entity framework to connect and get the list of departments
try
{
using (DefaultConnection db = new DefaultConnection())
{
var stud = from s in db.Students
select s;
//append the current direction to the Sort Column
String Sort = Session["SortColumn"].ToString() + " " + Session["SortDirection"].ToString();
grdStudents.DataSource = stud.AsQueryable().OrderBy(Sort).ToList();
grdStudents.DataBind();
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
// catch(Exception e)
//{
// Response.Redirect("/error.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();
}