How dowhen check selectedbranchid outside of post it is become null I...

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jQuery

Razor

ASP.NET-Core

I work on razor asp.net core .i face issue selectedbranchid is inside post form form is get selected value without any issue

but if i use another post and get selectedbranchid it become null why

so How to solve issue please

on page model

why bind property outside form become null and how to solve this issue

What I have tried:

[BindProperty]
        public string SelectedBranchId { get; set; }

<div id="ShelfLabelPrintrSetupAdcSupport" style="margin-top:20px;">
        <form id="FrmShelfLabelPrintrSetup" method="post" onsubmit="return validateForm() ">

            <div class="row">
                <div class="col-lg-12 col-12 row">
                    <div class="col-md-3 col-lg-2">
                        <label for="branch-selectlbl" style="margin-left:3px;font-size:15px;font-family: 'Open Sans', sans-serif;font-weight: bold;">Print Server</label>
                  
                        <select id="branch-select" asp-for="SelectedBranchId" name="selectbranchid" class="form-select" style="margin-left:3px;font-size:15px;font-family: 'Open Sans' , sans-serif;font-weight: bold;" onchange="toggleButtonVisibility()">
                            <option value="0">--Select--</option>
                            @foreach (var branches in Model.branches)
                            {

                                <option value="@branches.iBranchCode">@branches.vBranchDesc</option>


                            }
                        </select>
                       
                    </div>
                    <input type="hidden" id="SelectedText" name="SelectedText" asp-for="SelectedBranchId" value="SelectedBranchId" />
                    <div class="col-md-3 col-lg-2">
                        <br>
                        <button  id="Searchtxt" type="submit" name="searchButton" value="search" asp-page-handler="Search" style="width:100px;margin-top:7px;" class="btn btn-primary">Search</button>
                        

                    </div>

                    
                </div>
            </div>







        </form>

    </div>
</div>

<button id="createTxt" data-toggle="modal" data-target="#CreateshelflabelModal" style="width:100px;margin-top:7px;margin-left:7px;display:none;" class="btn btn-primary">Create</button>
 
now i will check another post method not related to form or another form different with post


Copy
public ActionResult OnPostCreateUsers(string selectbranchid)
        {

string selectedbranchid=SelectedBranchId;  here when check it become null

}