protected void btnAdd_Click(object sender, EventArgs e)
{
try
{
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
Int32 CourseID = Convert.ToInt32(ddlCourse.SelectedValue);
Enrollment objE = new Enrollment();
objE.StudentID = StudentID;
objE.CourseID = CourseID;
conn.Enrollments.Add(objE);
conn.SaveChanges();
//refresh
GetStudents();
}
}
catch (Exception exc)
{
Response.Redirect("~/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//instantiate a new student object in memory
Student s = new Student();
//decide if updating or adding, then save
if (Request.QueryString.Count > 0)
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
s = (from stu in conn.Students
where stu.StudentID == StudentID
select stu).FirstOrDefault();
}
//fill the properties of our object from the form inputs
s.FirstMidName = txtFirstName.Text;
s.LastName = txtLastName.Text;
s.EnrollmentDate = Convert.ToDateTime(txtEnrollDate.Text);
if (Request.QueryString.Count == 0)
{
conn.Students.Add(s);
}
conn.SaveChanges();
//redirect to updated departments page
Response.Redirect("students.aspx");
}
}
catch (Exception ex)
{
Response.Redirect("~/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//instantiate a new student object in memory
Course c = new Course();
//decide if updating or adding, then save
if (!String.IsNullOrEmpty(Request.QueryString["CourseID"]))
{
Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
c = (from crs in conn.Courses
where crs.CourseID == CourseID
select crs).FirstOrDefault();
}
//fill the properties of our object from the form inputs
c.Title = txtTitle.Text;
c.Credits = Convert.ToInt32(txtCredits.Text);
c.DepartmentID = Convert.ToInt32(ddlDepartment.SelectedValue);
if (Request.QueryString.Count == 0)
{
conn.Courses.Add(c);
}
conn.SaveChanges();
//redirect to updated departments page
Response.Redirect("Courses.aspx");
}
}
catch (Exception ex)
{
Response.Redirect("~/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//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");
}
}
catch (Exception ex)
{
Response.Redirect("~/error.aspx");
}
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//get the selected enrollment id
Int32 EnrollmentID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["EnrollmentID"]);
try
{
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
Enrollment objE = (from en in conn.Enrollments
where en.EnrollmentID == EnrollmentID
select en).FirstOrDefault();
conn.Enrollments.Remove(objE);
conn.SaveChanges();
GetStudents();
}
}
catch (Exception exception)
{
Response.Redirect("~/error.aspx");
}
}
protected void grdDepartments_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get the selected department id
Int32 DepartmentID = Convert.ToInt32(grdDepartments.DataKeys[e.RowIndex].Values["DepartmentID"]);
var d = (from dep in conn.Departments
where dep.DepartmentID == DepartmentID
select dep).FirstOrDefault();
//delete
conn.Departments.Remove(d);
conn.SaveChanges();
//update the grid
GetDepartments();
}
}
catch (Exception ex)
{
Response.Redirect("~/error.aspx");
}
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get the selected department id
Int32 CourseID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["CourseID"]);
var c = (from crs in conn.Courses
where crs.CourseID == CourseID
select crs).FirstOrDefault();
//delete
conn.Courses.Remove(c);
conn.SaveChanges();
//update the grid
GetCourses();
}
}
catch (Exception ex)
{
Response.Redirect("~/error.aspx");
}
}
protected void grdDepCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//get the selected Course id
Int32 CourseID = Convert.ToInt32(grdDepCourses.DataKeys[e.RowIndex].Values["CourseID"]);
try
{
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
Course objC = (from c in conn.Courses
where c.CourseID == CourseID
select c).FirstOrDefault();
conn.Courses.Remove(objC);
conn.SaveChanges();
GetDepartment();
}
}
catch (Exception exception)
{
Response.Redirect("~/error.aspx");
}
}
