How to Access Sub Master Page WebControl and Super Master Page WebControl on Content Page in Nesting of Master Page

Introduction

Sometimes, a scenario arises when we need to control the navigation of a page which is inherit Super Master Page and then Sub Master Page in nesting of Master Page. Then how do we access the Super Master Page web control and Sub Master Pager web control. Here are some tips.

Using the Code

Suppose we have a Master page named A and Master page B and then a Content Page.

Content Page inherits MasterPageB and MasterPageB inherits MasterPageA.

Now there is a navigation bar in MasterPageA and one in MasterPageB.

To access the li of navigation of MasterPageB from ContentPage who directly inherits MasterPageB, the code is:

The li should be runat="Server" and also had an id

ContentPlaceHolder cp = (ContentPlaceHolder)this.Master.Master.FindControl("ContentPlaceHolder1");

        System.Web.UI.HtmlControls.HtmlGenericControl liDepartment = 
    (System.Web.UI.HtmlControls.HtmlGenericControl)cp.FindControl("liDepartment"); 
liDepartment.Attributes.Add("class", "active");

To access the li of MasterPageA, the code is:

 System.Web.UI.HtmlControls.HtmlGenericControl liDashboard = 
  (System.Web.UI.HtmlControls.HtmlGenericControl)this.Master.Master.FindControl("liDashboard");
 liDashboard.Attributes.Add("class", "active");