posting object to web api though Method Not Allowed - http://localhost:54460/api/products?PostBag="

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WebAPI

Hi there
i have got the bellow simple api

public class ProductRepository : IProductPrpository
    {

        #region IProductPrpository Members

        public IEnumerable<Product> GetAll(string ProductOption)
        {
            return Utility.GetDiscountItems(ProductOption);
        }

        public Product GetProduct(string Id)
        {
            return Utility.GetProduct(Id);
        }
        public String PostBag(Bag bagofItem)
        {
           return  Utility.PostBagDiscountedItem(bagofItem);
        }

        #endregion
    }

it is working fine when i call GetProduct & GetProduct but when post for PostBag it through the above error
please help

there is my client side script which post data to PostBag Api

@model List<MultiBuy.Models.Product>

@{
    ViewBag.Title = "Index";
}

<h2>Items in the bag</h2>
<table>
    <tr>
        <th> Item_number_option       </th>
        <th> Option_number       </th>
        <th> Price      </th>    
        <th> PublicationCode      </th>    
        <th> Quantity      </th>   
        
    </tr>
   
     @foreach (var item in Model)
     {
         <tr>
             <td> @item.ItemNumber</td>
             <td> @item.Option</td>
             <td> @item.Price</td>
             <td> @item.PublicationCode</td>
             <td> @item.Quantity</td>
             
         </tr>
     }   
</table>
<div>
<ul id="products" />
<input type="button" value="Search" onclick="find();"  />
</div>
@section scripts {
    <script>
        function find() {
            var dataJSON = '@Model';
            
            $.ajax({
                type: 'POST',
                url: 'http://localhost:54460/api/products?PostBag=',
                data: JSON.stringify(dataJSON),
                contentType: 'application/json; charset=utf-8',
                dataType: 'json'
            }).done(function (data) {
                $('#products').text(data)
            });
        };

    </script>
}

appreciate all your help