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adding BLL to Main Project is working But Whenever Building a Project it Gives Error Like are you Missing a refrence or Using Directive is there any Better Solution
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Have you added the references to the main project? What about other projects? Without seeing or knowing the details this question can't be answered.
 
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Make sure:

1. You have referenced the correct assembly (dll)
2. You have included the right namespaces from the assembly (using keyword in C#).
3. You have used the correct Type names.
 
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resolved .select target framework same in all project
 
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