One issue which is faced while optimizing a Dynamic website is: how to optimise a website having Master and Child Pages...
Here is a solution which I find below : just add the server tags accordingly in master and child pages.
Add below text in master page:
<head>
<asp:contentplaceholder id="seo" runat="server" />
</head>
Add below text in all child pages which used above mentioned Master page:
<asp:content id="childseo" runat="server" ContentPlaceHolderID="seo" >
<meta name="keywords" content="enter your content here" />
<meta name="description" content="enter your content here" />
</asp:content>
<asp:content>...other content to design or code child page...</asp:content>
