Passing selected value of dropdownlist to a controller after postback - html

Question

How to pass the selected value of a drop down list from view to controller after postback. As i'm new to the MVC architecture any help will be greatly appreciated. Thanks in advance.
I need to filter data based on the values of dropdown list. But when i move to the next page of pagedlist then all my dropdown list's value is set to default value.
Controller
public ActionResult ViewDataOfDatabase(string sortorder, string currentFilter, string searchString, int? page,FormCollection collection)
{
CCIRepository _repository = CCIRepository.CreateRepository();
AirtelManagementModel _Airtelmodel = new AirtelManagementModel();
IEnumerable<CityListClass> CityList = _repository.GetCities();
IEnumerable<SelectListItem> CityNames = from c in CityList
select new SelectListItem()
{
Value = c.CityName.ToString(),
Text = c.CityName.ToString(),
Selected = c.CityName == Request["CityNames"],
};
ViewBag.CityList = CityNames;
IEnumerable<clsYearOfDate> SelectList = GetYears();
//IEnumerable<MonthListClass> SelectMonthList = GetMonths(YearId);
IEnumerable<SelectListItem> Yearitems = (from v in SelectList
select new SelectListItem()
{
Value = v.YearSelectedId.ToString(),
Text = v.YearOfDate.ToString(),
Selected = v.YearOfDate == Request["Yearitems"],
});
ViewBag.SelectList = Yearitems;
int DateId=0;
string CityName = string.Empty;
try
{
int SelectedYear = Convert.ToInt16(collection["Yearitems"].ToString());
int SelectedMonth = Convert.ToInt16(collection["MonthItems"].ToString());
CityName = collection["CityNames"].ToString();
DateId = _repository.GetImportDateId(SelectedYear, SelectedMonth);
ViewBag.SelectedYear = SelectedYear;
ViewBag.SelectedMonth = SelectedMonth;
ViewBag.SelectedCity = CityName;
}
catch(NullReferenceException Ex)
{
Console.WriteLine(Ex);
}
//IEnumerable<SelectListItem> MonthItems = (from m in SelectMonthList
// select new SelectListItem()
// {
// Value = m.MonthSelectedId.ToString(),
// Text = m.MonthName,
// });
//ViewBag.SelectMonthList = MonthItems;
IEnumerable<SelectListItem> MonthItems = Enumerable.Empty<SelectListItem>();
ViewBag.SelectMonthList = MonthItems;
List<AirtelManagementModel> list = ViewDetails();
ViewBag.CurrentSort = sortorder;
ViewBag.PhoneSortParm = String.IsNullOrEmpty(sortorder) ? "Phone_desc" : "";
if (searchString != null )
{
page = 1;
}
else
{
searchString = currentFilter;
}
//if(searchString!=null)
//{
ViewBag.CurrentFilter = searchString;
var airteldetails = from _model in list
select _model;
if(!String.IsNullOrEmpty(searchString) && DateId!=0 && !String.IsNullOrEmpty(CityName))
{
airteldetails = _repository.FilterAirtelDetails(searchString, DateId, CityName);
int PageSize = 5;
int PageNumber = (page ?? 1);
return View(airteldetails.ToPagedList(PageNumber, PageSize));
}
//airteldetails=airteldetails.OrderByDescending(A=>A.AirtelNumber);
int pageSize = 5;
int pageNumber = (page ?? 1);
//return View(airteldetails.ToList());
return View(airteldetails.ToPagedList(pageNumber, pageSize));
}
View
<h2 style="text-align:center">AirtelDetails</h2>
#using (Html.BeginForm("ViewDataOfDatabase", "AirtelManagement",FormMethod.Post))
{
<h3>Search by PhoneNumber:#Html.TextBox("SearchString",ViewBag.CurrentFilter as string)</h3>
<p><h3>Year:#Html.DropDownList("Yearitems",(IEnumerable<SelectListItem>)ViewBag.SelectList, "Select Year")</h3>
<h3>Month:#Html.DropDownList("MonthItems", (IEnumerable<SelectListItem>)ViewBag.SelectMonthList, "Select Month")</h3>
<h3>City: #Html.DropDownList("CityNames", (IEnumerable<SelectListItem>)ViewBag.CityList, "Select City")</h3></p>
<p><input type="submit" value="Search" /></p>
<script>
$(document).ready(function () {
$("#Yearitems").change(function () {
//debugger;
//alert($("#Yearitems>option:selected").attr("Value"));
$.ajax({
type: "Post",
url: '#Url.Action("GetMonths","AirtelManagement")',
data: { YearId: $("#Yearitems>option:selected").attr("Value") },
datatype: "Json",
success: function (data) {
//debugger;
$("#MonthItems").html("");
$.each(data, function (index, item) {
$("#MonthItems").append(new Option(item.MonthName, item.MonthSelectedId));
});
},
error: function () {
alert("Select Year");
}
});
});
});
</script>
}
Page #(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of #Model.PageCount
#Html.PagedListPager(Model, page => Url.Action("ViewDataOfDatabase", "AirtelManagement", new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))