protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try {
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get selected department ID
Int32 CourseID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["CourseID"]);
var c = (from course in conn.Courses
where course.CourseID == CourseID
select course).FirstOrDefault();
//save
conn.Courses.Remove(c);
conn.SaveChanges();
//redirect to updated departments page
GetCourses();
}
}
catch (Exception e2)
{
Response.Redirect("/error.aspx");
}
}
protected void GetStudents()
{
try {
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
var students = from s in conn.Students
select s;
grdStudents.DataSource = students.ToList();
grdStudents.DataBind();
}
}
catch (Exception e)
{
Response.Redirect("/error.aspx");
}
}
protected void GetDepartments()
{
try {
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//use link to query the Departments model
var deps = from d in conn.Departments
select d;
//bind the query result to the gridview
grdDepartments.DataSource = deps.ToList();
grdDepartments.DataBind();
}
}
catch (Exception e2)
{
Response.Redirect("/error.aspx");
}
}
protected void GetDepartment()
{
try {
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get id from url parameter and store in a variable
Int32 DepertmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
var deps = (from d in conn.Departments
orderby d.Name
select d);
ddlDepartment.DataSource = deps.ToList();
ddlDepartment.DataBind();
}
}
catch (Exception e2)
{
Response.Redirect("/error.aspx");
}
}
protected void GetDepartment()
{
try {
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get id from url parameter and store in a variable
Int32 DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
var d = (from dep in conn.Departments
where dep.DepartmentID == DepartmentID
select dep).FirstOrDefault();
//populate the form from our department object
txtName.Text = d.Name;
txtBudget.Text = d.Budget.ToString();
}
}
catch (Exception e)
{
Response.Redirect("/error.aspx");
}
}
protected void GetCourses()
{
try
{
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//use link to query the Departments model
var course = (from c in conn.Courses
select new { c.CourseID, c.Title, c.Credits, c.Department.Name });
//bind the query result to the gridview
String sort = Session["SortColumn"] + " " + Session["SortDirection"].ToString();
grdCourses.DataSource = course.AsQueryable().OrderBy(sort).ToList();
grdCourses.DataBind();
}
}
catch (Exception e)
{
Response.Redirect("/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try {
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//instantsiate a new course object in memory
Course objC = new Course();
//decide if updating or adding then save
if (!String.IsNullOrEmpty(Request.QueryString["CourseID"]))
{
Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
objC = (from c in conn.Courses
where c.CourseID == CourseID
select c).FirstOrDefault();
}
//fill the properties of our object from the form inputs
objC.Title = txtTitle.Text;
objC.Credits = Convert.ToInt32(txtCredits.Text);
objC.DepartmentID = Convert.ToInt32(ddlDepartment.SelectedValue);
if (String.IsNullOrEmpty(Request.QueryString["CourseID"])) {
conn.Courses.Add(objC);
}
conn.SaveChanges();
//redirect to updated departments page
Response.Redirect("courses.aspx");
}
}
catch (Exception e3)
{
Response.Redirect("/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//instantsiate a new department 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");
}
}
catch (Exception e2)
{
Response.Redirect("/error.aspx");
}
}
protected void GetCourse()
{
try
{
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get id from url parameter and store in a variable
Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
var course = (from c in conn.Courses
where c.CourseID == CourseID
select c).FirstOrDefault();
//populate the form from our department object
txtTitle.Text = course.Title;
txtCredits.Text = course.Credits.ToString();
}
}
catch (Exception e)
{
Response.Redirect("/error.aspx");
}
}
