How to get user selected value in the drop down box/combo box.Here tested easy best methods to get combo box value.

   $("#DropDownID option:selected").val();
// or
   $("#DropDownID :selected").val();

If you want to get selected text that can be get like this.

   $("#DropDownID option:selected").text();
// or
   $("#DropDownID :selected").text();

Also you can get this method.This is the fastest method.

   $("#DropDownID").children("option").is("selected").val();
//Simply
   $("#DropDownID").val();

This is also working.

   $('#DropDownID').find('option:selected').val();