在div内创建Div

大家好，
我只想使用C#.net.Im使用此代码在div内创建一个div.
已创建Div，但未在div中创建Div.请给我建议.
我该怎么办?

Hi all,
I just want to create a div inside div using C#.net.Im using this code.
Div is Created but Div not created inside div. Please suggest me.
Wht can i do?

System.Web.UI.HtmlControls.HtmlGenericControl Panel = new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
        Panel.ID = "panel1";
        Panel.Style.Add(HtmlTextWriterStyle.BackgroundColor, "White");
        Panel.Style.Add(HtmlTextWriterStyle.Height, "680px");
        Panel.Style.Add(HtmlTextWriterStyle.Width, "660px");
        Panel.Style.Add(HtmlTextWriterStyle.BorderColor, "Black");
        Panel.Style.Add(HtmlTextWriterStyle.BorderStyle, "Groove");
        Panel.Style.Add(HtmlTextWriterStyle.BorderWidth, "2px");
        System.Web.UI.HtmlControls.HtmlGenericControl div = new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
        div.ID = "panel12";
        div.Style.Add(HtmlTextWriterStyle.BackgroundColor, "White");
        div.Style.Add(HtmlTextWriterStyle.Height, "70px");
        div.Style.Add(HtmlTextWriterStyle.Width, "60px");
        div.Style.Add(HtmlTextWriterStyle.BorderColor, "Black");
        div.Style.Add(HtmlTextWriterStyle.BorderStyle, "Groove");
        div.Style.Add(HtmlTextWriterStyle.BorderWidth, "2px");
        this.Controls.Add(Panel);
        this.Controls.Add(div);