private void btnDelete_Click(object sender, EventArgs e)
{
int Id = Convert.ToInt32(txtID.Text);
//string FullName = "";
//string fName = "";
//if (cmboxInstructor.SelectedItem != null)
//{
// FullName = cmboxInstructor.SelectedItem.ToString();
// int pos = FullName.IndexOf(" ");
// fName = FullName.Substring(0, pos);
//}
//Instructor instructor = (from obj in db.Instructors
// where obj.fName == fName
// select obj).Distinct().FirstOrDefault();
//string crsName = cmboxCourse.SelectedItem.ToString();
//Course crs = (from obj in db.Courses
// where obj.crsName == crsName
// select obj).Distinct().FirstOrDefault();
instCourse instCourse = (from obj in db.instCourses
where obj.ID == Id
select obj).FirstOrDefault();
db.instCourses.Remove(instCourse);
db.SaveChanges();
txtID.Text = cmboxCourse.Text = cmboxInstructor.Text = string.Empty;
cmboxInstructor.Items.Clear();
cmboxCourse.Items.Clear();
cmboxCourseSearch.Items.Clear();
fillDataGridView();
fillComboboxCrs();
fillComboboxInst();
}
private void btnInsert_Click(object sender, EventArgs e)
{
string FullName = "";
string fName = "";
string lName = "";
if (cmboxInstructor.SelectedItem != null)
{
FullName = cmboxInstructor.SelectedItem.ToString();
int pos = FullName.IndexOf(" ");
fName = FullName.Substring(0, pos);
lName = FullName.Substring(pos + 1);
}
var instructor = (from obj in db.Instructors
where obj.fName == fName && obj.lName == lName
select new {
obj.instID
}).FirstOrDefault();
string crsName = cmboxCourse.SelectedItem.ToString();
Course crs = (from obj in db.Courses
where obj.crsName == crsName
select obj).Distinct().FirstOrDefault();
instCourse instCourse = new instCourse();
instCourse.crsID = crs.crsID;
instCourse.instID = instructor.instID;
instCourse.insCrsCode = 1000;
db.instCourses.Add(instCourse);
db.SaveChanges();
cmboxCourse.Text = cmboxInstructor.Text = string.Empty;
cmboxInstructor.Items.Clear();
cmboxCourse.Items.Clear();
cmboxCourseSearch.Items.Clear();
fillComboboxCrs();
fillComboboxInst();
fillDataGridView();
}
private void btnUpdate_Click(object sender, EventArgs e)
{
int Id = Convert.ToInt32(txtID.Text);
string FullName = "";
string fName = "";
string lName = "";
if (cmboxInstructor.SelectedItem != null)
{
FullName = cmboxInstructor.SelectedItem.ToString();
int pos = FullName.IndexOf(" ");
fName = FullName.Substring(0, pos);
lName = FullName.Substring(pos + 1);
}
Instructor instructor = (from obj in db.Instructors
where obj.fName == fName && obj.lName == lName
select obj).Distinct().FirstOrDefault();
string crsName = cmboxCourse.SelectedItem.ToString();
Course crs = (from obj in db.Courses
where obj.crsName == crsName
select obj).Distinct().FirstOrDefault();
instCourse instCourse = (from obj in db.instCourses
where obj.ID == Id
select obj).FirstOrDefault();
instCourse.crsID = Convert.ToInt32(crs.crsID);
instCourse.instID = Convert.ToInt32(instructor.instID);
instCourse.insCrsCode = 1000;
db.SaveChanges();
txtID.Text = cmboxCourse.Text = cmboxInstructor.Text = string.Empty;
cmboxInstructor.Items.Clear();
cmboxCourse.Items.Clear();
cmboxCourseSearch.Items.Clear();
fillDataGridView();
fillComboboxCrs();
fillComboboxInst();
}
