how to bind the dropdown in webgrid using mvc4

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MVC4

Dear friends

i have got the func<dynmic,object> error where the Model._user.select(d=>d.UserRole) in dropdownlist when binding the dropdown value in Webgrid

my coding s

Model:

public string UserLastName { get; set; }
public string UserEmail { get; set; }
public string UserRole { get; set; }

public class UserAccount
{
public IEnumerable<users> _User { get; set; }
public IEnumerable<SelectListItem> UserRoles { get; set; }

}

Controller:

public ActionResult Users()
{

var Data = _objUserRespository.GetUser();
var Model = new UserAccount();
{
Model._User = Data;
Model.UserRoles = new[]{
new SelectListItem{Text = "Admin",Value="Admin"},
new SelectListItem{Text = "Trader",Value="Trader"}
};
}
return View(Model);

View:

@model dataanalysys.Models.UserAccount

var grid = new webgrid(model._user)

@grid.gethtml(

columns:grid.columns(

grid.column("userlastanem"),

grid.column("useremail"),

grid.Column("UserRole", "User Role", format: @<text>
<label id="lblusrrole">
@item.UserRole
</label>



@Html.DropDownList("UserRole",Model._user.select(d=>d.UserRole),Model.UserRoles,new { id = "UserRole", @class = "edit-mode" })

)

how to solve this error , can anyone help me.