1 BY LOVE,
2 1- "beforeSend" event used to execute something before ajax call
3 2- "complete"   event used to execute something after the ajax called successfull.
4 
5$.ajax({
6                url: ' @Url.Action("AttendanceUpdateLate", "Attendance")',
7                data: { Emp: $("#txtEmpid").val(), Status: $("#ddlAttendance").val(), day: $("#ddlday").val(), Month: $("#Month").val() },
8                datatype: "json",
9                type: "POST",
10                contenttype: 'application/json; charset=utf-8',
11                async: true,
12                success: function (data) {
13                    alert(data);
14                },
15                beforeSend: function () {
16                    alert("Alert showing before AJAX call");
17
18                },
19                complete: function () {
20                  alert("Alert showing after AJAX call successfully");
21                    $("#txtEmpid").val('');
22                    $("#ddlday").val('');
23                    $("#ddlAttendance").val('');
24                },
25                error: function (xhr) {
26                    alert('error occured');
27                }
28            });