There is a concept in asp.net called theme. you have to implement themes
You can implement thems by adding new .skin file in your website:
1. Add one skin file in your website:
2. It will ask you to add in App_Themes folder say yes
3. Add the code in your skin file
Just for beginning add the code :
<asp:button runat="server" BackColor="lightblue" ForeColor="black" />
and save it.
Now in you webpage in Page Directive add the Theme property = skinfile ex:
<%@ Page Theme="SkinFile" Language="C#" AutoEventWireup="true" CodeFile="Default5.aspx.cs" Inherits="Default5" %>
Add one button in your webpage. And Run the page. You will get the effect of button as you have provided in the theme file
Same way you can apply theme to any webpage , and can crete themes of any Server Controls:
you will get so many articles on themes by googling
<http://www.dotnetfunda.com/articles/article402-working-with-themes-in-aspnet.aspx>
hope this will help you