Radio button and checkbox values get null on submit in asp.net MVC - asp.net-mvc

Question

Model is list here while clicking on submit button Radio button and checkbox values get null
#foreach (var item in Model)
{
#Html.HiddenFor(m => m[Countid].ActivityType)
<div class=" ">
<div class="clear">
</div>
#Html.Label("Group Name", "Group Name", new { #class = "control-label col-md-2", #style = "font-weight:700" })
<label class="control-label col-md-2"> : #item.PfpActivityGroup.ActivityGroupName</label>
</div>
<div class="">
#Html.Label("Activity Type", "Activity Type", new { #class = "control-label col-md-2", #style = "font-weight:700" })
<label class="control-label col-md-2"> : #item.ActivityType</label>
<div class="clear">
</div>
</div>
if (item.PfpQsnCreationMasters != null)
{
<div class=" ">
<label for="ActivityType" class="field-label">
Question Description
</label>
<label class="control-label col-md-2"> : #item.PfpQsnCreationMasters.SurveyDesc</label>
<div class="clear">
</div>
#Html.HiddenFor(m => m[Countid].PfpQsnCreationMasters.SurveyDesc)
#Html.DropDownList("NoOfOptions", ViewData["NoOfOptions"] as SelectList, new { #class = "hide" })
#Html.DropDownListFor(m => #item.PfpQsnCreationMasters.QuestionType, ViewData["QuestionType"] as SelectList, new { #class = "hide" })
#if (item.Type == "TextBox")
{
<div id="divTextBox">
#Html.TextBoxFor(x => item.txtQsnDesc);
#Html.HiddenFor(x => item.txtQsnDesc)
<div class="clear">
</div>
</div>
}
#if (item.Type == "RedioButton")
{
<div >
#if (item.option1 != null)
{
#Html.RadioButtonFor(x => item.RadioOptionSelected, #item.option1)
<label class="control-label col-md-2"> #item.option1</label>
<div class="clear">
</div>
}
#if (item.option2 != null)
{
#Html.RadioButtonFor(x => item.RadioOptionSelected, #item.option2)
<label class="control-label col-md-2"> #item.option2</label>
<div class="clear">
</div>
}
#if (item.option3 != null)
{
#Html.RadioButtonFor(x => item.RadioOptionSelected, #item.option3)
<label class="control-label col-md-2"> #item.option3</label>
<div class="clear">
</div>
}
#if (item.option4 != null)
{
#Html.RadioButtonFor(x => item.RadioOptionSelected, #item.option4)
<label class="control-label col-md-2"> #item.option4</label>
<div class="clear">
</div>
}
#Html.HiddenFor(x => item.RadioOptionSelected)
</div>
}
#if (item.Type == "CheckBox")
{
<div id="divCheckBox">
#if (item.ListTextBox1 != null)
{
#Html.CheckBoxFor(x => item.IsOption1Selected) <label class="control-label col-md-2"> #item.ListTextBox1</label>
#Html.HiddenFor(x => item.IsOption1Selected)
<div class="clear">
</div>
}
#if (item.ListTextBox2 != null)
{
#Html.CheckBoxFor(x => item.IsOption2Selected) <label class="control-label col-md-2"> #item.ListTextBox2</label>
#Html.HiddenFor(x => item.IsOption2Selected)
<div class="clear">
</div>
}
#if (item.ListTextBox3 != null)
{
#Html.CheckBoxFor(x => item.IsOption3Selected) <label class="control-label col-md-2"> #item.ListTextBox3</label>
#Html.HiddenFor(x => item.IsOption3Selected)
<div class="clear">
</div>
}
#if (item.ListTextBox4 != null)
{
#Html.CheckBoxFor(x => item.IsOption4Selected) <label class="control-label col-md-2"> #item.ListTextBox4</label>
#Html.HiddenFor(x => item.IsOption4Selected)
<div class="clear">
</div>
}
</div>
}
</div>
}
<div class="clear">
</div>
<br />
Countid = Countid + 1;
}

Answer 1

I would ordinarily add this as a comment but I lack the +50 rep
Try putting this on the Model value of the checkbox:
public class mymodel {
[DisplayFormat(ConvertEmptyStringToNull = false)]
public bool mycheckboxvalue { get; set; }
}