breadcrumb from code behind using Master/Content functionality

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ASP.NET

how to add each li as breadcrumb navigation , for website from master/content page..

i.e for exp. if i clicked on search , show breadcrumb for search , then when clicked on single page, show single page as breadcrumb and so on

I m using asp.net 3.5 , where i want this to be done and link to breadcrumb from code behind

pls advice

also , if i add li from test1.aspx to master page control in one page , and then i click on test2.aspx from link on test1.aspx ,

how to add other li after the li added in test1.aspx (i.e. the li in test1.aspx should remain , and then add test2.aspx li )

i hope you understood