ASP.NET MVC, where are these parameters coming from?
I am looking at a jqGrid implementation example for a ASP.NET MVC project. But I couldn't figure out where are those parameters in a this code come from?

 
    /// <summary>
    /// Editing product
    /// </summary>
    /// <param name="postData">postData collection</param>
    /// <returns>json data</returns>
    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult EditProduct(FormCollection postData)
    {
         //Editing product based on postData
         Product product = _repository.GetProduct(Convert.ToInt32(postData["id"]));
         product.ProductName = postData["ProductName"];
         product.SupplierID = Convert.ToInt32(postData["Supplier"]);
         product.CategoryID = Convert.ToInt32(postData["Category"]);
         product.QuantityPerUnit = postData["QuantityPerUnit"];
         product.UnitPrice = Convert.ToDecimal(postData["UnitPrice"].Replace(".", CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator));
         product.UnitsInStock = Convert.ToInt16(postData["UnitsInStock"]);
    
         //Sending changes back to repository
         bool success = true;
         try
         {
              _repository.SubmitChanges();
         }
         catch (Exception ex)
         {
              Debug.Write(ex.Message);
              success = false;
         }
    
        //Returning data - we can hadle this data in form afterSubmit event
        return Json(success);
    }

And here is related HTML code;

     <script type="text/javascript">
            $(document).ready(function() {
                $('#jqgProducts').jqGrid({
                    //url from wich data should be requested
                    url: '/Home/ProductsGridData/',
                    //type of data
                    datatype: 'json',
                    //url access method type
                    mtype: 'GET',
                    //columns names
                    colNames: ['ProductID', 'ProductName', 'SupplierID', 'CategoryID', 'QuantityPerUnit', 'UnitPrice', 'UnitsInStock'],
                    //columns model
                    colModel: [
                                { name: 'ProductID', index: 'ProductID', align: 'left' },
                                { name: 'ProductName', index: 'ProductName', align: 'left' },
                                { name: 'SupplierID', index: 'SupplierID', align: 'left' },
                                { name: 'CategoryID', index: 'CategoryID', align: 'left' },
                                { name: 'QuantityPerUnit', index: 'QuantityPerUnit', align: 'left' },
                                { name: 'UnitPrice', index: 'UnitPrice', align: 'left' },
                                { name: 'UnitsInStock', index: 'UnitsInStock', align: 'left' }
                                ],
                    //pager for grid
                    pager: $('#jqgpProducts'),
                    //number of rows per page
                    rowNum: 10,
                    //initial sorting column
                    sortname: 'ProductID',
                    //initial sorting direction
                    sortorder: 'asc',
                    //we want to display total records count
                    viewrecords: true,
                    //grid width
                    width: 'auto',
                    //grid height
                    height: 'auto'
                });
            }); 
    </script>
    </asp:Content>
    <asp:Content ID="cContent" ContentPlaceHolderID="cphContent" runat="server">
        <table id="jqgProducts" cellpadding="0" cellspacing="0"></table>
        <div id="jqgpProducts" style="text-align:center;"></div>
    </asp:Content>

The default route is:

    routes.MapRoute("Default", "{controller}/{action}", new { controller = "Home", action = "Basics" });

And my question is: Where are these parameters from following request generated? 

> http://localhost:49290/Home/ProductsGridData/?_search=false&nd=1314749470353&rows=10&page=1&sidx=ProductID&sord=asc


ASP.NET MVC, where are these parameters coming from?
===

I am looking at a jqGrid implementation example for a ASP.NET MVC project. But I couldn't figure out where are those parameters in a this code come from?

 
    /// <summary>
    /// Editing product
    /// </summary>
    /// <param name="postData">postData collection</param>
    /// <returns>json data</returns>
    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult EditProduct(FormCollection postData)
    {
         //Editing product based on postData
         Product product = _repository.GetProduct(Convert.ToInt32(postData["id"]));
         product.ProductName = postData["ProductName"];
         product.SupplierID = Convert.ToInt32(postData["Supplier"]);
         product.CategoryID = Convert.ToInt32(postData["Category"]);
         product.QuantityPerUnit = postData["QuantityPerUnit"];
         product.UnitPrice = Convert.ToDecimal(postData["UnitPrice"].Replace(".", CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator));
         product.UnitsInStock = Convert.ToInt16(postData["UnitsInStock"]);
    
         //Sending changes back to repository
         bool success = true;
         try
         {
              _repository.SubmitChanges();
         }
         catch (Exception ex)
         {
              Debug.Write(ex.Message);
              success = false;
         }
    
        //Returning data - we can hadle this data in form afterSubmit event
        return Json(success);
    }

And here is related HTML code;

     <script type="text/javascript">
            $(document).ready(function() {
                $('#jqgProducts').jqGrid({
                    //url from wich data should be requested
                    url: '/Home/ProductsGridData/',
                    //type of data
                    datatype: 'json',
                    //url access method type
                    mtype: 'GET',
                    //columns names
                    colNames: ['ProductID', 'ProductName', 'SupplierID', 'CategoryID', 'QuantityPerUnit', 'UnitPrice', 'UnitsInStock'],
                    //columns model
                    colModel: [
                                { name: 'ProductID', index: 'ProductID', align: 'left' },
                                { name: 'ProductName', index: 'ProductName', align: 'left' },
                                { name: 'SupplierID', index: 'SupplierID', align: 'left' },
                                { name: 'CategoryID', index: 'CategoryID', align: 'left' },
                                { name: 'QuantityPerUnit', index: 'QuantityPerUnit', align: 'left' },
                                { name: 'UnitPrice', index: 'UnitPrice', align: 'left' },
                                { name: 'UnitsInStock', index: 'UnitsInStock', align: 'left' }
                                ],
                    //pager for grid
                    pager: $('#jqgpProducts'),
                    //number of rows per page
                    rowNum: 10,
                    //initial sorting column
                    sortname: 'ProductID',
                    //initial sorting direction
                    sortorder: 'asc',
                    //we want to display total records count
                    viewrecords: true,
                    //grid width
                    width: 'auto',
                    //grid height
                    height: 'auto'
                });
            }); 
    </script>
    </asp:Content>
    <asp:Content ID="cContent" ContentPlaceHolderID="cphContent" runat="server">
        <table id="jqgProducts" cellpadding="0" cellspacing="0"></table>
        <div id="jqgpProducts" style="text-align:center;"></div>
    </asp:Content>

The default route is:

    routes.MapRoute("Default", "{controller}/{action}", new { controller = "Home", action = "Basics" });

And my question is: Where are these parameters from following request generated? 

> http://localhost:49290/Home/ProductsGridData/?_search=false&nd=1314749470353&rows=10&page=1&sidx=ProductID&sord=asc

