This is a 3 tier architecture demo for .net frame work.
I created this demo arch. in visual studio 2010. the framework is 4.0
1.1st I created an empty website in visual studio.
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then in that web site I created a web form according to my requirement.
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after that I created 2 class list named BL and DAL.
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I added DAL reference to BL and then BL reference to My website.
to open this project in visual studio...you have to open the three-tier\Project\3Tier\3Tier.sln file In some cases only BL and DAL will load...so in that case change the website path accordingly(from the error path).
And in the connection string(DAL/Class1) please insert your DB name and password etc to run this project.