Drop down list selected index event in asp.net mvc

Question

Drop down list selected index event in asp.net mvc 4.0 with postback ....



I want to retiain the selected value in dropdown list ...


my requirement is i had three drop down list in view...in need the selected values for threee drop downs

in any action ....


can u help the same as soon as possilble...


Key point is that we should not use any javascript to get this......................

Another point i want all this in the controller itself...............