<fieldset hides when page re-loads - MVC 5 - asp.net-mvc

Question

EDIT:
Here is the exact problem that I have demonstrate, please have a look and as soon as I click the submit button it post back and lost its state and as you can see in the sample code I have three pages I'm posting the form
1) EmployeeForm, 2) EmployerForm, 3) ContractorForm
https://dotnetfiddle.net/wVtwgW
How do I persist the checkbox?
Once I post the page and it reloads the same page if I have my data-model invalid and it display the error message on the screen but the problem is that, it hides the fieldset and the user has to click the checkbox again to show the fieldset.
my question is: how can I still show the fieldset and show the error message in it?
//my scripts that shows the fieldset
<script>
$(document).ready(function() {
$('#Employee').change(function() {
if (this.checked) {
$('#emp').show();
}
});
});
</script>
//it shows the fieldset with checkbox:
<fieldset class="fieldset-auto-width">
<legend>
Select Employee
</legend>
<table width="auto">
<tr>
<th>
Employee
</th>
<td>
#Html.CheckBox("Employee")
</td>
</tr>
</table>
</fieldset>
//my form where I have all the input text and button etc...
<fieldset id="emp" style="display: none" class="fieldset-auto-width">
<legend>
Employee Display
</legend>
#using (Html.BeginForm("EmployeeServer", "EmployeeForm", FormMethod.Post))
{
#Html.ValidationSummary(true)
<div>..... </div>
}
</fieldset>

Answer 1

Instead of using #Html.CheckBox() use #Html.CheckBoxFor()
<td>
#Html.CheckBoxFor(m => m.Employee)
</td>
this will retain the state of the checkbox when you return the model state errors..
in your javascript, just call the $("#Employee") change event after the page loads..
$(document).ready(function() {
$('#Employee').change(function() {
if (this.checked) {
$('#emp').show();
}
});
$('#Employee').trigger("change");
});
Set the Fieldset display value when view is rendered
<fieldset id="emp" style="#(Model.Employee ? "": "display: none")" class="fieldset-auto-width">
<legend>
Employee Display
</legend>
#using (Html.BeginForm("EmployeeServer", "EmployeeForm", FormMethod.Post))
{
#Html.ValidationSummary(true)
<div>..... </div>
}
</fieldset>
this will hide the fieldset if Model.Employee = false or display it if Model.Employee = true.

Answer 2

Just do it with JavaScript. Look for the rendered element from the validation summary helper, and if it exists then you can show your employee form. You can add it to your already executing script like this:
$(document).ready(function() {
$('#Employee').change(function() {
if (this.checked) {
$('#emp').show();
}
});
//check for validation summary elements
if($('.validation-summary-errors').length > 0){
//and show previous entry if present
$('#emp').show();
}
});