How can we change a Master Page at runtime?

Write the code behind of the content page (.aspx.cs) protected void Page_PreInit(object sender, EventArgs e) { this.MasterPageFile = "~/MasterPage2.master"; }

Using page events we can change the master page during runtime. In Page_PreInit() event we can change the master page by setting the “MasterPageFile” property to the path of the master page what we have to set.