protected void btnAdd_Click(object sender, EventArgs e)
{
using (comp2007Entities db = new comp2007Entities())
{
Enrollment objE = new Enrollment();
objE.StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
objE.CourseID = Convert.ToInt32(ddlCourse.SelectedValue);
db.Enrollments.Add(objE);
db.SaveChanges();
//add to the enrollments table
GetEnrollments();
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//use EF to connect to SQL server
using (comp2007Entities db = new comp2007Entities())
{
//use the student model to save the new record
Course c = new Course();
Int32 CourseID = 0;
//check the query string for an id so we can determine add / update
if (Request.QueryString["CourseID"] != null)
{
//get the ID from the URL
CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
//get the current student from Entity Framework
c = (from objS in db.Courses
where objS.CourseID == CourseID
select objS).FirstOrDefault();
}
c.Title = txtTitle.Text;
c.Credits = Convert.ToInt32(txtCredits.Text);
c.DepartmentID = Convert.ToInt32(ddDepartment.SelectedValue);
//call add only if we have no student ID
if (CourseID == 0)
db.Courses.Add(c);
db.SaveChanges();
//redirect to the updated students page
Response.Redirect("courses.aspx");
}
}
catch (Exception)
{
Server.Transfer("/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//use EF to connect to SQL server
using (comp2007Entities db = new comp2007Entities())
{
//use the student model to save the new record
Student s = new Student();
Int32 StudentID = 0;
//check the query string for an id so we can determine add / update
if (Request.QueryString["StudentID"] != null)
{
//get the ID from the URL
StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
//get the current student from Entity Framework
s = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
}
s.LastName = txtLastName.Text;
s.FirstMidName = txtFirstMidName.Text;
s.EnrollmentDate = Convert.ToDateTime(txtEnrollmentDate.Text);
//call add only if we have no student ID
if (StudentID == 0)
db.Students.Add(s);
db.SaveChanges();
//redirect to the updated students page
Response.Redirect("students.aspx");
}
}
catch (Exception)
{
Server.Transfer("/error.aspx");
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
//use EF to connect to SQL server
using (comp2007Entities db = new comp2007Entities())
{
//use the student model to save the new record
Department d = new Department();
Int32 DepartmentID = 0;
//check the query string for an id so we can determine add / update
if (Request.QueryString["DepartmentID"] != null)
{
//get the ID from the URL
DepartmentID = Convert.ToInt32(Request.QueryString["DepartmentID"]);
//get the current student from Entity Framework
d = (from objS in db.Departments
where objS.DepartmentID == DepartmentID
select objS).FirstOrDefault();
}
d.Name = txtDeptName.Text;
d.Budget = Convert.ToDecimal(txtBudget.Text);
//call add only if we have no student ID
if (DepartmentID == 0)
db.Departments.Add(d);
db.SaveChanges();
//redirect to the updated students page
Response.Redirect("departments.aspx");
}
}
catch (Exception)
{
Server.Transfer("/error.aspx");
}
}
protected void grdStudents_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//get the selected studentID using the grid's data key collection
Int32 StudentID = Convert.ToInt32(grdStudents.DataKeys[e.RowIndex].Values["StudentID"]);
try
{
//use Entity Framework to remove the selected student from the db
using (comp2007Entities db = new comp2007Entities())
{
Student s = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
//do the delete
db.Students.Remove(s);
db.SaveChanges();
}
}
catch (Exception)
{
Server.Transfer("/error.aspx");
}
//refresh the grid
GetStudents();
}
protected void grdDepartment_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//get the selected studentID using the grid's data key collection
Int32 CourseID = Convert.ToInt32(grdDepartment.DataKeys[e.RowIndex].Values["CourseID"]);
try
{
//use Entity Framework to remove the selected student from the db
using (comp2007Entities db = new comp2007Entities())
{
var objE = from en in db.Enrollments
where en.CourseID == CourseID
select en;
//do the delete
foreach (var enrollments in objE)
{
db.Enrollments.Remove(enrollments);
}
db.SaveChanges();
Course objC = (from c in db.Courses
where c.CourseID == CourseID
select c).FirstOrDefault();
//do the delete
db.Courses.Remove(objC);
db.SaveChanges();
}
}
catch (Exception)
{
Server.Transfer("/error.aspx");
}
//refresh the grid
GetDepartment();
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//store which row was clicked
Int32 selectedRow = e.RowIndex;
//get the selected studentID using the grid's data key collection
Int32 CourseID = Convert.ToInt32(grdCourses.DataKeys[selectedRow].Values["CourseID"]);
try
{
//use Entity Framework to remove the selected student from the db
using (comp2007Entities db = new comp2007Entities())
{
Course c = (from objS in db.Courses
where objS.CourseID == CourseID
select objS).FirstOrDefault();
//do the delete
db.Courses.Remove(c);
db.SaveChanges();
}
}
catch (Exception)
{
Server.Transfer("/error.aspx");
}
//refresh the grid
GetCourses();
}
