breadcrumb with master content url

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ASP.NET

Hi
How to assign sitemapnode url for each content page , from content page code behind..
i.e. i use default.aspx , then goto test1.aspx

the breadcrumb must be

test1

then when i click test2.aspx from link in test1.aspx,
test1 href="test1.apsx?testshow=1"

show breadcrumb as
test1 /test2


then from test2.aspx, user clicks on link to test3.aspx

test2.aspx="test2.aspx?testval=2";

test1.aspx should have href as "test1.apsx?testshow=1"


and so on same when test3.aspx clicked