How Do I Display Total Cost Using Checkbox Datavalues From Database In Mvc View

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C#5.0

MVC5

this is the bookingview model

public class BookingView
   {
       public string treatment { get; set; }

       public string TreatmentName { get; set; }

       public int bookingID { get; set; }

       public int clientID { get; set; }

       public int treatmentID { get; set; }

       public DateTime date { get; set; }

       public String location { get; set; }

       public double cost { get; set; }

       public int numberOfPeole { get; set; }

       public String status { get; set; }

       public double treatmentCost { get; set; }

       public bool Check { get; set; }

       public  List<TreatmentView> Treatmentses { get; set; }

this is the treatmentview model

public class TreatmentView
   {
       [Key]
       [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
       public int treatmentID { get; set; }

       [Required(ErrorMessage="Please enter Treatment name")]
       [Display(Name = "Treatment name")]
       public string treatmentName { get; set; }

       [Required(ErrorMessage = "Please enter Treatment cost")]
       [Display(Name = "Treatment cost")]
       [DataType(DataType.Currency)]
       public double treatmentCost { get; set; }

       [Required(ErrorMessage = "Please enter Treatment duration")]
       [Display(Name = "Treatment duration")]
       public int treatmentDuration { get; set; }

       public bool check { get; set; }

bookingcontroller

public ActionResult MakeBooking(BookingView model)
{
    ViewData["Total"] = _boo.CalcTotalCost(model.cost).ToString(CultureInfo.CurrentCulture);

    treats.Check = treats.Check;
    model.TreatmentName = treats.TreatmentName;
    book.cost = model.cost;
    book.numberOfPeole = model.numberOfPeole;
    book.date = model.date;
    book.location = model.location;

    IEnumerable<TreatmentView> treatmentes = new List<TreatmentView>();

    model.Treatmentses= (List<TreatmentView>) treatmentBusiness.GetAllTreatments();

    return View(model);
}

bookingbusiness method cost in the the businesslogic

public double CalcTotalCost(double Cost)
       {
           var bv = new BookingView();

           Cost = 0.00;


           for (var i = 0; i < bv.Treatmentses.Count; i++)
           {
               if (bv.Treatmentses[i].treatmentName == "true")
               {
                   Cost += bv.treatmentCost;
               }
           }

           return Cost;
       }

finally the view of the makebooking

@using System.Collections
@using System.Text
@using Physiq.Data
@using Physiq.Model
@model Physiq.Model.BookingView


@{
    ViewBag.Title = "MakeBooking";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>MakeBooking</h2>
@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>MakeBooking</h4>
        <hr/>
        @for(var i=0;i<Model.Treatmentses.Count();i++)
        {
            @Html.ValidationSummary(true, "", new { @class = "text-danger" })
            <div class="form-group">
                @Html.CheckBox(@Model.Treatmentses[i].treatmentName)@Model.Treatmentses[i].treatmentName
                
            </div>
        }
        <div class="form-group">
            @Html.LabelFor(model => model.date, htmlAttributes: new {@class = "control-label col-md-2"})
            <div class="col-md-10">
                @Html.EditorFor(model => model.date, new {htmlAttributes = new {@class = "form-control"}})
                @Html.ValidationMessageFor(model => model.date, "", new {@class = "text-danger"})
            </div>
        </div>
       
        <div class="form-group">
            @Html.LabelFor(model => model.location, htmlAttributes: new {@class = "control-label col-md-2"})
            <div class="col-md-10">
                @Html.EditorFor(model => model.location, new {htmlAttributes = new {@class = "form-control"}})
                @Html.ValidationMessageFor(model => model.location, "", new {@class = "text-danger"})
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.numberOfPeole, htmlAttributes: new {@class = "control-label col-md-2"})
            <div class="col-md-10">
                @Html.EditorFor(model => model.numberOfPeole, new {htmlAttributes = new {@class = "form-control"}})
                @Html.ValidationMessageFor(model => model.numberOfPeole, "", new {@class = "text-danger"})
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.cost, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.cost, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.cost, "", new { @class = "text-danger" })
            </div>
        </div>


    <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <span class="glyphicon glyphicon-save" aria-hidden="true"></span>
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
    
    @Html.Label((string) @ViewData["Total"])
}

this is the error that comes up on the browser.but when i comment out my for loop in the business logic method the view displays the checkboxes with the view names along side them.but getting the display of the sum of the checked checkboxes is a problem

any kind of direction or help will be appreciated my email is minenhlegcabashe@gmail.com