asp.net 4.0 - 双向绑定

Question

双向绑定不适用于给定的代码。我错过了什么？

<asp:FormView ID="editCustomer" runat="server" >
    <EditItemTemplate>
        <asp:TextBox ID="firstName" runat="server" Text="<%# Bind('Name') %>" />
    </EditItemTemplate>
</asp:FormView>


public partial class WebForm1 : System.Web.UI.Page
{
    private string name;

    public string Name
    {
        get { return name; }
        set { name = value; }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Name = "Chennai";
        }
        else
        {
            string obj = Name;
        }
    }
}