I am using a master page on a no of pages.How do I add meta description or meta keywords to each page

I am using a master page on a no of pages.How do I add meta description or meta keywords to each page

<%@ Page Language="C#" MasterPageFile="~/IdeaScope.master" 
  AutoEventWireup="true" CodeFile="is.aspx.cs" Inherits="_is"
  CodeFileBaseClass="BasePage" 
  
  Title="Effective Customer Feedback Management, 
      Improve Customer Commmunication" 
  
  Meta_Keywords="Customer Feedback, Customer Opinion, feedback, opinion,
       idea, ideas, idea management, customer feedback management,         
        product management, product manager, product marketing,         
        product marketing manager"
                              
  Meta_Description="IdeaScope is an on-demand and embedded solution that 
       allows you to capture, prioritize and centrally manage customer 
       feedback. Make your customer feedback process more efficient. Save 
       time and involve more stakeholders without significant cost." 
  %>

You can also add these tags in code behind like below if you are using .net 3.5 or later

Page.MetaDescription="description";