protected void btnSave_Click(object sender, EventArgs e) { //connect using (DefaultConnection conn = new DefaultConnection()) { //instantiate a new deparment object in memory Department d = new Department(); //decide if updating or adding, then save if (Request.QueryString.Count > 0) { Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]); d = (from dep in conn.Departments where dep.DepartmentID == DepartmentID select dep).FirstOrDefault(); } //fill the properties of our object from the form inputs d.Name = txtName.Text; d.Budget = Convert.ToDecimal(txtBudget.Text); if (Request.QueryString.Count == 0) { conn.Departments.Add(d); } conn.SaveChanges(); //redirect to updated departments page Response.Redirect("departments.aspx"); } }
protected void btnSave_Click(object sender, EventArgs e) { //do insert or update using (DefaultConnection db = new DefaultConnection()) { Course objC = new Course(); if (!String.IsNullOrEmpty(Request.QueryString["CourseID"])) { Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]); objC = (from c in db.Courses where c.CourseID == CourseID select c).FirstOrDefault(); } //populate the course from the input form objC.Title = txtTitle.Text; objC.Credits = Convert.ToInt32(txtCredits.Text); objC.DepartmentID = Convert.ToInt32(ddlDepartment.SelectedValue); if (String.IsNullOrEmpty(Request.QueryString["CourseID"])) { //add db.Courses.Add(objC); } //save and redirect db.SaveChanges(); Response.Redirect("courses.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 btnAdd_Click(object sender, EventArgs e) { using (DefaultConnection db = new DefaultConnection()) { //get tje values needed Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]); Int32 CourseID = Convert.ToInt32(ddlCourse.SelectedValue); //populate the new enrollment object Enrollment objE = new Enrollment(); objE.StudentID = StudentID; objE.CourseID = CourseID; //save db.Enrollments.Add(objE); db.SaveChanges(); //refresh GetStudent(); } }
//NOT WORKING, TRIED USING STUDENT ID AND ENROLLMENT ID, KEEPS THROWING ERROR WHEN //PRESSING DELETE protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e) { Int32 EnrollmentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["EnrollmentID"]); using (DefaultConnection db = new DefaultConnection()) { Enrollment objE = (from en in db.Enrollments where en.EnrollmentID == EnrollmentID select en).FirstOrDefault(); //processs the deletetion db.Enrollments.Remove(objE); db.SaveChanges(); //reopoulate the page GetCourse(); } }
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 grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e) { Int32 CourseID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["CourseID"].ToString()); using (DefaultConnection db = new DefaultConnection()) { Course objC = (from c in db.Courses where c.CourseID == CourseID select c).FirstOrDefault(); db.Courses.Remove(objC); db.SaveChanges(); } GetCourses(); }
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e) { Int32 CourseID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["CourseID"]); using (DefaultConnection db = new DefaultConnection()) { Course objE = (from en in db.Courses where en.CourseID == CourseID select en).FirstOrDefault(); //processs the deletetion db.Courses.Remove(objE); db.SaveChanges(); //reopoulate the page GetDepartment(); } }
protected void grdDepartments_RowDeleting(object sender, GridViewDeleteEventArgs e) { //connect using (DefaultConnection conn = new DefaultConnection()) { //get the selected DepartmentID Int32 DepartmentID = Convert.ToInt32(grdDepartments.DataKeys[e.RowIndex].Values["DepartmentID"]); var d = (from dep in conn.Departments where dep.DepartmentID == DepartmentID select dep).FirstOrDefault(); //process the delete conn.Departments.Remove(d); conn.SaveChanges(); } //update the grid GetDepartments(); }