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1.First Create on Website
2.Add one Master Page
3.Add One WebForm and add with Master Page
4.Create one Css page
https://www.asp.net/web-forms/overview/older-versions-getting-started/master-pages/creating-a-site-wide-layout-using-master-pages-cs
http://www.aspdotnet-suresh.com/2014/07/master-page-with-menu-control-in-aspnet-example.html
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Give some extensive explain sir.
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Add external CSS to Master page
<link href="MyStyle.css" rel="stylesheet" type="text/css"> in head tag.
<asp:Textbox id="Textbox1" runat="server" CssClass="your class/id name">