c# - comparing two List<> -

i have gridview control checkbox on it

when hit on save button able find checkbox have been checked , able far problem is:

let if user tries uncheck checkedbox how track changes , save db has been checked. anyhelp?.. in regards have created 2 list comparision... hope make sense here.

i want compare 2 list , if changes save else ....do something...

<asp:templatefield headertext="select">  <itemtemplate>         <asp:checkbox id="chkselected" runat="server" checked="false"></asp:checkbox>    </itemtemplate>  </asp:templatefield>        list<employee> listfromdb = new list<employee>(); listfromdb = employeelistfromdb ; //loads list  list<employee> selectedemployee = new list<employee>(); selectedemployee = myselectedemployee //loads list  //employee object looks this: id name 

here got stuck , here doing...

foreach (employee item in myselectedemployee ) {     bool _flag = false;     _flag = employeeservice.saveemployee(item.id, item.name); } 

you want this:

var diff = selectedemployee.except(listfromdb, (a,b)=>a.id==b.id); foreach (employee e in diff) {     employeeservice.saveemployee(e.id, e.name); } 

but you're awful short on particulars. defines change? how match items in list: id? can more exact requirements?