protected void GetCourse()
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//get the slected 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 enrollment grid
var Enrollments = from en in db.Enrollments
where en.CourseID == CourseID
select en;
//bind to grid
grdEnrollments.DataSource = Enrollments.ToList();
grdEnrollments.DataBind();
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
using (DefaultConnection db = new DefaultConnection())
{
Student stud = new Student();
if (!String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
stud = (from d in db.Students where d.StudentID == StudentID select d).FirstOrDefault();
}
stud.LastName = txtLName.Text;
stud.FirstMidName = txtFName.Text;
stud.EnrollmentDate = Convert.ToDateTime(txtEnrollmentDate.Text);
if (String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
db.Students.Add(stud);
}
db.Students.Add(stud);
db.SaveChanges();
Response.Redirect("students.aspx");
}
}
protected void GetStudent()
{
//look up the selected student and fill the form
using (DefaultConnection db = new DefaultConnection())
{
//store the id from url in a variable
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//look up student record based on id above
Student stud = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
//pre populate form fields based on record info above
txtLastName.Text = stud.LastName;
txtFirstName.Text = stud.FirstMidName;
txtDateEnrolled.Text = stud.EnrollmentDate.ToString();
//populate enrollment grid
var Enrollments = from en in db.Enrollments
from c in db.Courses
where en.StudentID == StudentID
where c.CourseID == en.CourseID
select en;
//bind to grid
grdCourses.DataSource = Enrollments.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()
{
using (DefaultConnection db = new DefaultConnection())
{
var studs = from d in db.Students
select d;
grdStudents.DataSource = studs.ToList();
grdStudents.DataBind();
}
}
protected void GetCourses()
{
//use Entity Framework to connect and get the list of Departments
using (DefaultConnection db = new DefaultConnection())
{
var crs = from c in db.Courses
select c;
//bind the deps query result to our grid
grdCourses.DataSource = crs.ToList();
grdCourses.DataBind();
}
}
protected void GetStudents()
{
//use Entity Framework to connect and get the list of Departments
using (DefaultConnection db = new DefaultConnection())
{
var studs = from d in db.Students
select d;
//bind the deps query result to our grid
grdStudents.DataSource = studs.ToList();
grdStudents.DataBind();
}
}
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 the department
Department dep = (from d in db.Departments where d.DepartmentID == DepartmentID select d).FirstOrDefault();
//prepopulate the form fields
txtName.Text = dep.Name;
txtBudget.Text = dep.Budget.ToString();
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
using (DefaultConnection db = new DefaultConnection())
{
Student stud = (from d in db.Students
where d.StudentID == StudentID
select d).FirstOrDefault();
db.Students.Remove(stud);
db.SaveChanges();
GetStudents();
}
}
protected void GetDepartments()
{
using (DefaultConnection db = new DefaultConnection())
{
//get 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)
{
//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 GetStudent()
{
//look up the selected student and fill the form
using (DefaultConnection db = new DefaultConnection())
{
//store the id from url in a variable
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//look up student record based on id above
Student stud = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
//pre populate form fields based on record info above
txtLastName.Text = stud.LastName;
txtFirstName.Text = stud.FirstMidName;
txtDateEnrolled.Text = stud.EnrollmentDate.ToString();
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//identify the student ID to be deleted from the row the user selected
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
//connect to db
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
GetStudents();
}
}
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 GetStudent()
{
using (DefaultConnection db = new DefaultConnection())
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
Student stud = (from d in db.Students where d.StudentID == StudentID select d).FirstOrDefault();
txtLName.Text = stud.LastName;
txtFName.Text = stud.FirstMidName;
txtEnrollmentDate.Text = stud.EnrollmentDate.ToString();
//populate student enrollment grid
var Enrollments = from en in db.Enrollments
where en.StudentID == StudentID
select en;
//bind to grid
grdCourseEnrollments.DataSource = Enrollments.ToList();
grdCourseEnrollments.DataBind();
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
// create a new student in memory
Student stud = new Student();
//check for a url
if (!String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
//get id from url
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//look up the student
stud = (from s in db.Students
where s.StudentID == StudentID
select s).FirstOrDefault();
}
// fill properties of new student
stud.LastName = txtLastName.Text;
stud.FirstMidName = txtFirstName.Text;
stud.EnrollmentDate = Convert.ToDateTime(txtDateEnrolled.Text);
//add if we have no id in the url
if (String.IsNullOrEmpty(Request.QueryString["StudentID"]))
{
stud.EnrollmentDate = System.DateTime.Now;
db.Students.Add(stud);
}
db.SaveChanges();
//redirect to students list page
Response.Redirect("students.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
using(DefaultConnection db = new DefaultConnection())
{
//create a new department in memory
Department dep = new Department();
//check for a url
if(!String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
//get the id from url
Int32 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
//add if we have no id in the url
if (String.IsNullOrEmpty(Request.QueryString["DepartmentID"]))
{
db.Departments.Add(dep);
}
//save the new department
db.Departments.Add(dep);
db.SaveChanges();
//redirect
Response.Redirect("departments.aspx");
}
}