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    <p>Simple:</p> <pre><code>public ActionResult GetTreeview(string id, string company) { // company is not being used... var parentId = Convert.ToInt32(id); var jsTree = (from category in db.Categories where category.ICG_PARENT_ID == parentId orderby category.ICG_CATEGORY_NAME select new JsTreeModel { data = category.ICG_CATEGORY_NAME, attr = new JsTreeAttribute { id = category.ICG_CATEGORY_ID.ToString() }, state = "closed", }).ToArray(); return Json(jsTree, JsonRequestBehavior.AllowGet); } </code></pre> <p><hr> For the conditional where clause, there's a couple of ways you could do this and they're not going to make much difference in this isolated example. You could either conditionally use one of two queries that has your where clause:</p> <pre><code>JsTreeModel[] jsTree; if (parentId == 0) { var companyId = Convert.ToInt32(company); jsTree = (from category in db.Categories where category.ICG_PARENT_ID == parentId &amp;&amp; category.ICG_COMPANY_ID == companyId //etc... ).ToList(); } else { jsTree = (from category in db.Categories where category.ICG_PARENT_ID == parentId //etc.. ).ToList(); } </code></pre> <p>Or you could break the query where you would have inserted the where clause, conditionally append the additional clause, and finish the query:</p> <pre><code>// get the first part of the query IQueryable&lt;Category&gt; query = db.Categories .Where(category =&gt; category.ICG_PARENT_ID == parentId); // conditionally add the where clause if (parentId == 0) { var companyId = Convert.ToInt32(company); query = query.Where(category =&gt; category.ICG_COMPANY_ID == companyId); } // finish the query var jsTree = query .OrderBy(category =&gt; category.ICG_CATEGORY_NAME) .AsEnumerable() // use LINQ to Objects from this point on .Select(category =&gt; new JsTreeModel { data = category.ICG_CATEGORY_NAME, attr = new JsTreeAttribute { id = category.ICG_CATEGORY_ID.ToString() }, state = "closed", }).ToArray(); </code></pre>
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    1. COBrilliant. This might be a separate question, but company was unused because I was still looking for a way to conditionally add a where clause. If the id is 0, "Where x.icg_company_id == (int)company" needs to be added, but I couldn't figure that out.
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    2. CO@user: That could be done rather easily too using a number of different ways. I'll update my answer to show how you could do that.
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    3. COJust a note, your answer maintained x.ICG_CATEGORY_ID, but you had renamed x to category just above.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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