asp.net core razor show div if model has data

Question

I want to show a div if the asociated model has data after OnPost. What I tried is 

 

 

@if (Model.HazIds != null)
    {
        <div id="HazardIdentification">
            <p class="text-lg-left text-primary pl-1 mt-1 mb-1" style="font-size:24px">Hazard Identification</p>
            <div class="row no-gutters">
                <div class="col-3">
                    <label for="NameGT" class="form-control badge-primary">Hazard Class</label>
                </div>
                <div class="col-3">
                    <label for="EquipmentUsed" class="form-control badge-primary">Hazard Detail</label>
                </div>
                <div class="col-3">
                    <label for="Oxygen" class="form-control badge-primary">Hazard Protective Measure Class</label>
                </div>
                <div class="col-3">
                    <label for="LEL" class="form-control badge-primary">Hazard Protective Measure Detail</label>
                </div>
            </div>
            @foreach (var item1 in Model.HazIds)
            {
                <div class="row no-gutters">
                    <div class="col-3">
                        <span class="form-control" style="font-size:12px;">@Html.DisplayFor(modelItem => item1.HazClass)</span>
                    </div>
                    <div class="col-3">
                        <span class="form-control" style="font-size:12px;">@Html.DisplayFor(modelItem => item1.HazDetails)</span>
                    </div>
                    <div class="col-3">
                        <span class="form-control" style="font-size:12px;">@Html.DisplayFor(modelItem => item1.HazPMClass)</span>
                    </div>
                    <div class="col-3">
                        <span class="form-control" style="font-size:12px;">@Html.DisplayFor(modelItem => item1.HazPMDetails)</span>
                    </div>
                </div>
            }
        </div>
    }

  

but is not giving then results expected. If I use !=null it shows the div content (labels) even when model has no data; if I use ==null it does not show anything even if the model has data

 

HazIds is an IList model containing int and strings