How to set checkbox items checked, after click submit

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ASP.NET

MVC3

Hi
My view code is :

@using(Html.BeginForm("submit","Security",FormMethod.Post)) 
{ 

@foreach (var item in Model.app_function) 

{ 

 <input type="checkbox" name="Functioncheck" value="@item.app_function_id"/> 
                    @Html.Encode(item.app_function_name)

}

    <input type="submit" value="submit" /> 
} 

after click submit button checked values are saved into database, but checked values are unchecked.

My controller code is:

[AcceptVerbs(HttpVerbs.Post)]
        public ViewResult submit(FormCollection fm)
        {

                    string Roleecheck = Request.Form["Functioncheck"].ToString();
                    string[] x = Roleecheck.Split(',');
                    int a = Convert.ToInt32(x.Length);
                    for (int i = 0; i < x.Length; i++)
                    {
                        int userid = Convert.ToInt32(x[i]);
                        var myEntity = new user_role { role_id = id, user_id = userid, created_date = DateTime.Now, created_by = 1 };
                        UpdateModel(myEntity);
                        am.Add(myEntity);
                    }
                    am.Save();

return view();

        }

Give me some idea for how to set checkbox checked items, after click submit.

Thanks.