Lambda expression good people please help me on the follow

Question

if (collection["Department"] == "" || collection["Department"] == null || collection["Department"] == "0")

{

var Department = (from x in db.Departments

where x.Id == 1

orderby x.description ascending

select x.Id).First();

Result.DepartmentId = Department;

}

else

{

var Department = (from x in db.Departments

where x.description == collection["Department"]

orderby x.description ascending

select x.Id).First();

Result.DepartmentId = Department;

}