$.ajax({
                async: false,
                url: $('#ajaxURLclockoutDetails').val(),
                type: 'GET',
                cache: false,
                data: {
                    newServiceCode: Selectedvalue,
                    'ConsumerServiceAndPeriod.ConsumerID': $('#DConsumerID').val()
                },
                success: function (result) {
                        
  1) $('#ConsumerServiceAndPeriod.TimesheetID').val(result.TimesheetID);
or
2) @Html.HiddenFor(m => m.TimesheetID, new { Value =@<%'$("#DConsumerID").val()'%> })                                                           
       
 or
3)@Html.Hidden("ConsumerServiceAndPeriod.TimesheetID", 
result.TimesheetID)
          
 } 
                     
   });