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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

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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