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 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");
}
}
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 the list of departments
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();
}
}
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();
txtFirstName.Text = stu.LastName;
txtName.Text = stu.FirstMidName;
txtEnrollmentDate.Text = Convert.ToString(stu.EnrollmentDate);
}
}
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"]);
//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();
}
}
