@Html.DropDownList("CType",new List<SelectListItem> {
new SelectListItem{Text = "All",Value = "0"},
new SelectListItem{Text = "Outgoing",Value ="Outgoing"},
new SelectListItem{Text = "Incoming", Value ="Incoming"},
}, new { @class = "form-control input-md"})
如果我选择第二个值，我想在多个请求中保留选定的下拉值