asp.net mvc3 模糊查询

public ActionResult GetPrograms(int pageSize = 10, int pageIndex = 1)
        {
            string pgm_name = Request.Form["pgm_name"].ToString();
var pageCount = (_db.Prgorams.Count() - 1) / pageSize + 1;
            ViewBag.PageCount = pageCount;
            ViewBag.PageIndex = pageIndex;
            ViewBag.PageSize = pageSize;
            var prg = _db.Prgorams
                .Where(c => c.pgm_nameContains(pgm_name) = pgm_name )   
                .OrderByDescending(a => a.pgm_code)
                .Skip((pageIndex - 1) * pageSize)
                .Take(pageSize)
                .ToList();
            ViewBag.pgm_name = pgm_name;
            return View(prg);          
        }

@using (Html.BeginForm()) {
<input type='text' id='pgm_name' name='pgm_name' value="@ViewBag.pgm_name" />
    <input type="submit" value="查询" />