母版页A(homeMP.master)

母版页B(innerMP.master)

内容页(about.html)

内容页继承于母版页B，母版B继承于母版A

innerMP masterpage2 = (innerMP)this.Master;
MasterPage masterpage = (MasterPage)masterpage2.Master;
ContentPlaceHolder cph = (ContentPlaceHolder)(masterpage.FindControl("ContentPlaceHolderTitle"));
Literal litertitle = new Literal();
litertitle.Text = "展览展示租赁、节目演出、鼓乐表演、舞蹈表演-陕西万迪文化传播有限公司";
cph.Controls.Add(litertitle);