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; } }