如何在MVC环境中的MasterPage顶部显示欢迎"CurrentUserName"？

<asp:Label ID="lblWelcome" runat="server"></asp:Label>

protected void Page_Load(object sender, EventArgs e)
{
    if (User.Identity.IsAuthenticated)
    {
        string currentUserName = User.Identity.Name;
        lblWelcome.Text = "欢迎 " + currentUserName + "！";
    }
}