如何在控制器中初始化值？

Question

我有下拉列表：

@Html.DropDownListFor(m => m.Register.SelectCompany, Model.Register.Company, "Please select")

我有模特：

[Required(ErrorMessage = "*")]
[Display(Name = "Company name")]
public int SelecCompanyId{ get; set; }

public System.Web.Mvc.SelectList CompanyName{ get; set; }

当我尝试这样做时：

companyAccount.Company = (ICompany)Company.Find(model.Register.SelectCompanyId);

我收到错误

  

具有键＆＃39; Register.SelectCompanyId＆＃39;的ViewData项。是的   输入＆＃39; System.Int32＆＃39;但必须是类型   ＆＃39; IEnumerable的＆＃39;＆＃34;}

我的课程也是：

public class Company: ICompany
{
    public int Id { get; set; }
    public string CompanyName  { get; set; }
}