Question: how to add crystal report dll in visual studio 2015?
Answer: Step 1: Open your project in Visual Studio . NET. Open the Solution Explorer, expand the Project tag in the tree and select the References tag. ... 
Step 2: On the Add Reference dialog, select the CrystalDecisions. CrystalReports. ... 
Step 3: Save the project. You can either build from Visual Studio . ... 
Ankit Chauhan.