Adding the dynamic row in ASP .net mvc jquery grid?

I need to add the dynamic row in jquery datatable and in ajax success event. but i am getting the undefined method error. Please find the below code and help me to solve.

Controller:

[HttpPost]
public ActionResult SaveItems(Int32 customer, Int32 product, Int32 quantity, Int32 saleId)
{
if (saleId > 0)
{
TBL_Sale obj = new TBL_Sale();
obj.CustomerId = customer;
obj.CreatedBy = 1;
obj.CreatedDate = DateTime.Now;
objDb.TBL_Sale.Add(obj);
objDb.SaveChanges();
}
TBL_SaleItems saleItemId = SaveIndividualItem(product, quantity, saleId);
return View(saleItemId);
}
public TBL_SaleItems SaveIndividualItem(Int32 product, Int32 quantity, Int32 saleId)
{
TBL_Stock objStock = objDb.TBL_Stock.Where(w => w.ProductId == product).SingleOrDefault();
TBL_SaleItems obj = new TBL_SaleItems();
obj.ProductId = product;
obj.Qty = quantity;
obj.SaleId = saleId;
obj.PricePerQty = objStock.PricePerQty;
obj.StockId = objStock.Id;
obj.SuplierId = objStock.SupplierId;
obj.Amount = objStock.PricePerQty * quantity;
objDb.TBL_SaleItems.Add(obj);
objDb.SaveChanges();
return obj;
}

View Code:

@section Scripts {
}
"text/css">
.bs-example {
font-family: sans-serif;
position: relative;
margin: 100px;
}
.typeahead, .tt-query, .tt-hint {
border: 2px solid #CCCCCC;
border-radius: 8px;
font-size: 22px; /* Set input font size */
height: 30px;
line-height: 30px;
outline: medium none;
padding: 8px 12px;
width: 396px;
}
.typeahead {
background-color: #FFFFFF;
}
.typeahead:focus {
border: 2px solid #0097CF;
}
.tt-query {
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset;
}
.tt-hint {
color: #999999;
}
.tt-menu {
background-color: #FFFFFF;
border: 1px solid rgba(0, 0, 0, 0.2);
border-radius: 8px;
box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
margin-top: 12px;
padding: 8px 0;
width: 422px;
}
.tt-suggestion {
font-size: 22px; /* Set suggestion dropdown font size */
padding: 3px 20px;
}
.tt-suggestion:hover {
cursor: pointer;
background-color: #0097CF;
color: #FFFFFF;
}
.tt-suggestion p {
margin: 0;
}
"text/javascript">
class="container">
class="form-horizontal" action="/action_page.php">
class="form-group">
"text" class="typeahead tt-query" autocomplete="off" spellcheck="false">
class="control-label col-sm-1" for="txCustomer">Customer
class="col-md-8">
"text" class="form-control" id="txCustomer" placeholder="Customer" name="Customer">

class="col-md-2">

"submit" class="btn btn-default">Submit

class="form-group">

class="control-label col-sm-1" for="txtProduct">Product

class="col-md-2">

"text" class="form-control" id="txtProduct" placeholder="Product Name" name="Product">