How to store selected drop down list value as global in MVC razor

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C#

I have three dropdowns all are coming from partialview .....first and sec dropdown load on page load, third one depends upon passing first and second dropdown value as parameter in third but as I am not using any event on first or loading third one on the click of second dropdown I am only getting second dropdwon value in parameter not first one, can anyone help me in same... I am using Ajax.BeginForm in dropdownlist.

First DropDown

@Html.DropDownListFor(
m => m.SelectedYearId,
new MultiSelectList(ViewBag.Years,"YearID", "Years"),
"Select Year",new { Multiple = "multiple", @class = "multiselect", style = "width: 250px"}
)

Second Drop Down
@model WebReports.Models.Entities

@using (Ajax.BeginForm("LoadCompbyMatchType", "ICC", new AjaxOptions { UpdateTargetId = "Comp" }))
{

@Html.HiddenFor(m => m.SelectedYearId)
@Html.HiddenFor(m => m.SelectedReportId)
@Html.DropDownListFor(
m => m.SelectedMatchTypeId,
new MultiSelectList(ViewBag.MatchType, "MatchTypeID", "MatchTypeName"),
"Select a Match Type",new { Multiple = "multiple", @class = "select", style = "width: 250px"}
)

}

Third Drop Down

@if (ViewBag.Comp != null)
{
using (Ajax.BeginForm("LoadMatchbyComp", "ICC", new AjaxOptions { UpdateTargetId = "Match" }))
{

@Html.HiddenFor(m => m.SelectedYearId)
@Html.HiddenFor(m => m.SelectedMatchTypeId)
@Html.DropDownListFor(
m => m.SelectedCompId,
new SelectList(ViewBag.Comp,"CompetitionID", "CompetitionName"),
string.Empty
)

}

}

<script type="text/javascript">
$('#SelectedCompId').change(function ()
{
$(this).parents('form').submit();
});
</script>

<script type="text/javascript">
$('#SelectedMatchTypeId').change(function ()
{
$(this).parents('form').submit();
});


[HttpPost]
public ActionResult LoadCompbyMatchType(IEnumerable(string) SelectedMatchTypeId, IEnumerable(string) SelectedYearId)
{

}


Not Able to get SelectedYearId