Question

Okay, so we all know about changing a master page dynamically in a page’s OnPreInit event.

But what about a nested master page? Can I change a master’s master?

There is no OnPreInit event exposed in the MasterPage class.

Any ideas?

Answer 1

Just tested this and it works from the PreInit of the Page that is using the nested MasterPage.

protected void Page_PreInit(object sender, EventArgs e) {     this.Master.MasterPageFile = '/Site2.Master'; } 

Obviously you will need to ensure that the ContentPlaceholderIds are consistent across the pages you are swapping between.