.net dynamic title implementation method

Method 1:
front desk:
<title><%=PageTitle%></title>
Backstage:
public string PageTitle;
PageTitle = "My Title";
Method 2:
front desk:
<title><asp:Literal runat="server"></asp:Literal></title>
Backstage:
= "My Title";
Method 3:
front desk:
<title runat="server"></title>
Backstage:
= "My Title";
Method 4:
Backstage:
("<script>='My title';</script>");
Method 5:
Backstage:
("<title>My title</title>");