To view the .NET hands on lab, go to the following link and look for the .NET section:
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<a href="http://www.oracle.com/technology/obe/11gr2_db_prod/index/index.htm#t3s7"> http://www.oracle.com/technology/obe/11gr2_db_prod/index/index.htm#t3s7</a>

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If this link no longer works, go to 
<a href="http://otn.oracle.com/dotnet">http://otn.oracle.com/dotnet</a> and look in the upper right hand corner for an "Oracle by Example" link.