public void xoa(string ten)
{
tiente tt = (from t in db.tientes select t).Single(a => a.tiente1 == ten);
db.tientes.DeleteOnSubmit(tt);
db.SubmitChanges();
}
public void sua(string ten, float tygia, string ghichu)
{
tiente tt = (from t in db.tientes select t).Single(a => a.tiente1 == ten);
tt.tygia = tygia;
tt.ghichu = ghichu;
db.SubmitChanges();
}
public void moi(string ten, float tygia, string ghichu)
{
tiente tt = new tiente();
tt.tiente1 = ten;
tt.tygia = tygia;
tt.ghichu = ghichu;
db.tientes.InsertOnSubmit(tt);
db.SubmitChanges();
}
