Retain DropDownList selected value after submitting Form in ASP.Net Core MVC

Hi,

I have problem to get data using DropDownList.

After I selected date from DropDownList, then submit button, that DropDownList reset to 0 value.

I want to keep data even though I clicked submit button not to reset value which is "0".

Please check my code and help me how to hold data?

<h2 id="Choosedurrent">Choose Current</h2>
    <select id="YearCu" name="YearCu" style="width: 150px;height: 40px;">
        <option value="0">Please Select Year</option>
        <option value="2021">2021</option>
        <option value="2022">2022</option>
        <option value="Other">Other</option>
    </select>
    <br />
    <select id="Month" name="Month" style="width: 150px;height: 40px;" onchange="this.form.submit()" >
        <option value="0">Please Select Month</option>
        <option value="1">Jan</option>
        <option value="2">Feb</option>
        <option value="3">March</option>
        <option value="4">April</option>
        <option value="5">May</option>
        <option value="6">June</option>
        <option value="7">July</option>
        <option value="8">Aug</option>
        <option value="9">Sep</option>
        <option value="10">Oct</option>
        <option value="11">Nov</option>
        <option value="12">Dec</option>
    </select>
</td>
<td style="padding:20px;">
    <h2 id="Comparess">Compare </h2>
    <select id="YearCom" name="YearCom" style="width: 150px;height: 40px;">
        <option value="0">Please Select Year</option>
        <option value="2021">2021</option>
        <option value="2022">2022</option>
 
    </select>
    <br />
    <select id="MonthCom" name="MonthCom" style="width: 150px;height: 40px;">
        <option value="0">Please Select Month</option>
        <option value="1">Jan</option>
        <option value="2">Feb</option>
        <option value="3">March</option>
        <option value="4">April</option>
        <option value="5">May</option>
        <option value="6">June</option>
        <option value="7">July</option>
        <option value="8">Aug</option>
        <option value="9">Sep</option>
        <option value="10">Oct</option>
        <option value="11">Nov</option>
        <option value="12">Dec</option>
    </select> 
    <select id="txtOther01" name="Presetss" style="width: 220px; height: 40px; display: none;">
        <option value="0">Please Select Preset</option>
        <option value="ytd">Year-To-Date</option>
 
    </select>
</td> 

[HttpGet]
public ActionResult SalesGraph(string YearCu, string Month, string YearCom, string MonthCom, string Presetss)
{
    var Username5 = User.Identity.Name;
    ViewBag.Arrival = Month;
 
    var ok1 = db.Users.Where(x => x.UserName == Username5).FirstOrDefault();
    if (ok1 != null)
    {
        ViewBag.Ok2 = ok1.Po_Name;
        ViewBag.Ok3 = ok1.Hired_date.ToString("MM/dd/yyyy");
        ViewBag.Ok4 = ok1.Department2;
        ViewBag.Ok5 = ok1.User_Point;
        ViewBag.Ok6 = ok1.Name;
        ViewBag.Ok9 = ok1.Pto_Point;
        ViewBag.Ok10 = ok1.Personal_Leave;
        ViewBag.Ity = db.Messages.Where(x => x.Isread == false && x.MessageTo == ok1.Name).Count();
 
        if (ok1.Position_order <= 5)
        {
            ViewBag.Ok7 = "Manager";
        }
        if (ok1.Position_order == 3 && ok1.Department1 == "Retail Experience")
        {
            ViewBag.Ok8 = "Manager";
        }
    return View();
}