.Net MVC verify only one checkox checked - validation

Question

I have a model called Employee with a boolean field called OnDuty. Our business rules only allow for one employee on duty.
On the index page, I've setup the checkbox so they trigger an update call to update the employee as being "on call". However, I'm not set any other employees to off duty using my controller action below. How do I go about making sure that no other employee is on duty?
[HttpPost]
public JsonResult Update(Employee employee)
{
IEnumerable<Employee> onCallEmployee = _db.Employees.Where(e => e.OnCall == true);
foreach (Employee e in onCallEmployee) {
e.OnCall = false;
_db.Entry(e).State = EntityState.Modified;
_db.SaveChanges();
}
_db.Entry(employee).State = EntityState.Modified;
_db.SaveChanges();
return Json("Employee updated!");
}

Answer 1

It appears that my error(s) were caused by the way I was trying to update the employees. I had to exclude the employee which was already being updated by the function from onCallEmployee because it would throw an error (Attaching an entity of type 'Employee' failed because another entity of the same type already has the same primary key value.) when trying to save the updates.
Also, based on #mwwallace8, suggestion, I removed the SaveChanges() call from the for loop and left a single call at the end.
[HttpPost]
public JsonResult Update(Employee employee)
{
IEnumerable<Employee> onCallEmployee = _db.Employees.Where(e => e.OnCall == true && e.ID != employee.ID);
foreach (Employee e in onCallEmployee) {
e.OnCall = false;
_db.Entry(e).State = EntityState.Modified;
}
_db.Entry(employee).State = EntityState.Modified;
_db.SaveChanges();
return Json("Employee updated!");
}