protected void GetCourse() { //connect using (DefaultConnection db = new DefaultConnection()) { //get the selected courseid from 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 GetStudent() { //look up selected student and fill form using (DefaultConnection db = new DefaultConnection()) { //store id from the url in a variable Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]); //look up student Student stud = (from s in db.Students where s.StudentID == StudentID select s).FirstOrDefault(); //populate form fields txtLast.Text = stud.LastName; txtFirst.Text = stud.FirstMidName; txtEnroll.Text = stud.EnrollmentDate.ToString(); //populate all courses student is enrolled in var objK = (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 == StudentID select new {en.EnrollmentID, en.Grade, c.Title, d.Name}); grdCourses.DataSource = objK.ToList(); grdCourses.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 GetStudents() { //use enity framework to connect to get list of students using (DefaultConnection db = new DefaultConnection()) { var stud = from s in db.Students select s; //bind stud query results to our grid grdStudents.DataSource = stud.ToList(); grdStudents.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 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 department list var Departments = from d in db.Departments orderby d.Name select d; //bind dropdown list ddlDepartment.DataSource = Departments.ToList(); ddlDepartment.DataBind(); //add default option for dropdown after it's filled ListItem DefaultItem = new ListItem("-Select-", "0"); ddlDepartment.Items.Insert(0, DefaultItem); } }
protected void btnSave_Click(object sender, EventArgs e) { //connect using (DefaultConnection db = new DefaultConnection()) { //create new course and fill 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 btnSave_Click(object sender, EventArgs e) { using (DefaultConnection db = new DefaultConnection()) { //create a new student in memory Student stud = new Student(); Int32 StudentID = 0; //check for url if (!String.IsNullOrEmpty(Request.QueryString["StudentID"])) { //get id from url StudentID = Convert.ToInt32(Request.QueryString["StudentID"]); //look up the student stud = (from s in db.Students where s.StudentID == StudentID select s).FirstOrDefault(); } //fill the properties of the new student stud.LastName = txtLast.Text; stud.FirstMidName = txtFirst.Text; stud.EnrollmentDate = Convert.ToDateTime(txtEnroll.Text); //add if we have no id in the url if (StudentID == 0) { db.Students.Add(stud); } //save the student db.SaveChanges(); //redirect to student list page Response.Redirect("students.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 grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e) { //identify id of student to delete from the row the user has chosen Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]); //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 grid Response.Redirect("students.aspx"); } }
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 grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e) { //get selected id Int32 EnrollmentID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["EnrollmentID"]); //connect using (DefaultConnection db = new DefaultConnection()) { //get record Enrollment objK = (from en in db.Enrollments where en.EnrollmentID == EnrollmentID select en).FirstOrDefault(); //delete db.Enrollments.Remove(objK); db.SaveChanges(); //refresh GetStudent(); } }