protected void btnSave_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//instantiate a new deparment object in memory
Departments d = new Departments();
//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");
}
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
Int32 CourseID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["CourseID"].ToString());
using (DefaultConnectionEF db = new DefaultConnectionEF())
{
Courses objC = (from c in db.Courses
where c.CourseID == CourseID
select c).FirstOrDefault();
db.Courses.Remove(objC);
db.SaveChanges();
}
GetCourses();
}
protected void grdDepartments_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//connect
using (DefaultConnectionEF conn = new DefaultConnectionEF())
{
//get the selected DepartmentID
Int32 DepartmentID = Convert.ToInt32(grdDepartments.DataKeys[e.RowIndex].Values["DepartmentID"]);
var d = (from dep in conn.Departments
where dep.DepartmentID == DepartmentID
select dep).FirstOrDefault();
System.Diagnostics.Debug.WriteLine("hi:" + e.ToString());
//process the delete
conn.Departments.Remove(d);
conn.SaveChanges();
//update the grid
GetDepartments();
}
}
protected void grdStudents_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 StudentID = Convert.ToInt32(grdStudents.DataKeys[selectedRow].Values["StudentID"]);
//use EF to remove the selected student from the db
using (DefaultConnectionEF db = new DefaultConnectionEF())
{
Students s = (from objS in db.Students
where objS.StudentID == StudentID
select objS).FirstOrDefault();
//do the delete
db.Students.Remove(s);
db.SaveChanges();
}
//refresh the grid
GetStudents();
}
protected void btnSave_Click(object sender, EventArgs e)
{
//use EF to connect to SQL Server
using (DefaultConnectionEF db = new DefaultConnectionEF())
{
//use the Student model to save the new record
Students s = new Students();
Int32 StudentID = 0;
//check the querystring 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 EF
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);
}
//run the update or insert
db.SaveChanges();
//redirect to the updated students page
Response.Redirect("students.aspx");
}
}
protected void btnAdd_Click(object sender, EventArgs e)
{
using (DefaultConnectionEF db = new DefaultConnectionEF())
{
//get the values needed
Int32 StudentID = Convert.ToInt32(Request.QueryString["StudentID"]);
Int32 CourseID = Convert.ToInt32(ddlCourse.SelectedValue);
//populate the new enrollment object
Enrollments objE = new Enrollments();
objE.StudentID = StudentID;
objE.CourseID = CourseID;
objE.Grade = 0;
//save
db.Enrollments.Add(objE);
db.SaveChanges();
//refresh
GetStudent();
}
}
protected void grdCourses_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//get the selected EnrollmentID
Int32 EnrollmentID = Convert.ToInt32(grdCourses.DataKeys[e.RowIndex].Values["EnrollmentID"]);
using (DefaultConnectionEF db = new DefaultConnectionEF())
{
Enrollments objE = (from en in db.Enrollments
where en.EnrollmentID == EnrollmentID
select en).FirstOrDefault();
//process the deletion
db.Enrollments.Remove(objE);
db.SaveChanges();
//repopulate the page
GetStudent();
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
//do insert or update
using (DefaultConnectionEF db = new DefaultConnectionEF())
{
Courses objC = new Courses();
if (!String.IsNullOrEmpty(Request.QueryString["CourseID"]))
{
Int32 CourseID = Convert.ToInt32(Request.QueryString["CourseID"]);
objC = (from c in db.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(ddlDepartment.SelectedValue);
if (String.IsNullOrEmpty(Request.QueryString["CourseID"]))
{
//add
db.Courses.Add(objC);
}
//save and redirect
db.SaveChanges();
Response.Redirect("courses.aspx");
}
}