Hi James,
Welcome to the MSDN forum.
What's the project type of your project? And there is any error message during VS 2015 connect to the database? According to your description, your issue is more related to the usage or development of the VS 2015, we need the detail information to help
us to analysis this issue and find a appropriate forum, since our forum is to discuss the VS setup and Installation, thank you for your understanding.
Meanwhile, when you use the database in VS 2015, please make sure the option 'Microsoft
SQL Server Data Tools' in the VS installer is checked(which means already installed), you can go to Control Panel--Programs and Features and right-click the VS 2015 item and change-modify, check this option, if not checked,
please select it and install.
Best regards,
Sara
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