[DotNetDevelopment] Unable to access datalayer class and method in business layer...

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I have a class in Data layer(DAL1.cs)  and business layer (BAL1.cs).
I added referene to my business layer. I am able to access this
DAL1.cs in my BAL1. cs.
Later I added DAL2.cs class in data layer and BAL2.cs in  business
layer
now i am unable to access this DAL2 class in BAL2.  Can any one help
me out?