protected void btnAdd_Click(object sender, EventArgs e)
{
try
{
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//Get the values
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
Int32 CourseID = Convert.ToInt32(ddlCourse.SelectedValue);
//Instantiate the enrollment object
Enrollment objE = new Enrollment();
//Populate, save, and refresh
objE.StudentID = StudentID;
objE.CourseID = CourseID;
conn.Enrollments.Add(objE);
conn.SaveChanges();
GetStudent();
}
}
catch (System.IO.IOException e5)
{
Server.Transfer("/error.aspx", true);
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get the Department Id
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
var s = (from stud in conn.Students
where stud.StudentID == StudentID
select stud).FirstOrDefault();
//process the delete
conn.Students.Remove(s);
conn.SaveChanges();
//update the grid
GetStudents();
}
}
catch (System.IO.IOException e2)
{
Server.Transfer("/error.aspx", true);
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//instantiate a new deparment object in memory
Student s = new Student();
//decide if updating and then re-query the updated Students
if (Request.QueryString.Count > 0)
{
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
s = (from stud in conn.Students
where stud.StudentID == StudentID
select stud).FirstOrDefault();
}
//fill in the values
s.FirstMidName = txtFirstMidName.Text;
s.LastName = txtLastName.Text;
s.EnrollmentDate = Convert.ToDateTime(txtEnrollmentDate.Text);
//Only add a new record if it's not updating an existing one
if (Request.QueryString.Count == 0)
{
conn.Students.Add(s);
}
conn.SaveChanges();
//redirect to the Students page
Response.Redirect("students.aspx");
}
}
catch (System.IO.IOException e2)
{
Server.Transfer("/error.aspx", true);
}
}
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 and then re-query the updated departments
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 in the values
d.Name = txtName.Text;
d.Budget = Convert.ToDecimal(txtBudget.Text);
//Only add a new record if it's not updating an existing one
if (Request.QueryString.Count == 0)
{
conn.Departments.Add(d);
}
conn.SaveChanges();
//redirect to the departments page
Response.Redirect("departments.aspx");
}
}
catch (System.IO.IOException e2)
{
Server.Transfer("/error.aspx", true);
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
Courses objC = new Courses();
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();
}
//Populate the course from the input form
objC.Title = txtTitle.Text;
objC.Credits = Convert.ToInt32(txtCredits.Text);
objC.DepartmentID = Convert.ToInt32(ddlDepartments.SelectedValue);
if (String.IsNullOrEmpty(Request.QueryString["CourseID"]))
{
//add
conn.Courses.Add(objC);
}
conn.SaveChanges();
Response.Redirect("courses.aspx");
}
}
catch (System.IO.IOException e3)
{
Server.Transfer("/error.aspx", true);
}
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//Get the desired 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();
GetStudent();
}
}
catch (System.IO.IOException e3)
{
Server.Transfer("/error.aspx", true);
}
}