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copied!<p>I modified my code like below, it works perfect! Thanks "jk." !!!</p> <p>The view code is like below:</p> <pre><code><head runat="server"> <link href="../../Content/jquery-ui-1.8.14.custom.css" rel="stylesheet" type="text/css" /> <script src="../../Scripts/jquery-1.6.2.min.js" type="text/javascript"></script> <script src="../../Scripts/jquery-ui-1.8.14.custom.min.js" type="text/javascript"></script> </head> <script type="text/ecmascript"> $(document).ready(function () { $.ajax({ type: "GET", url: "/Product/GetProductName/", dataType: "json", contentType: "application/json; charset=utf-8", data: { categoryID: <%: Model.Select(o => o.Category.CategoryName).Distinct().Count() > 1 ? 0 : Model.FirstOrDefault().CategoryID %> }, success: function(data) { if (data.length > 0) { var dataFromServer = []; for (i = 0 ; i < data.length; i++) { dataFromServer[i] = data[i].ProductName; } }; $('#productNameSearch').autocomplete({ source: dataFromServer }); }, error: function (XMLHttpRequest, textStatus, errorThrown) { alert(textStatus); } }); }); </script> <% using (Html.BeginForm("ProductNameSearch", "Product", FormMethod.Post)) {%> <input type="text" id="productNameSearch" name="productNameSearch" style="width:300px" />&nbsp; <input type="submit" value="Go!" /> <%}%> </code></pre> <p>The controller code is like below:</p> <pre><code>[HttpGet] public ActionResult GetProductName(int? categoryID) { Product product = new Product { CategoryID = categoryID }; return Json(from p in pr.SearchProductList(product) select new { ProductName = p.ProductName }, JsonRequestBehavior.AllowGet); } </code></pre>

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