User-166373564 posted
Hi ying,
Please restart your VS, and clean and rebuild your application, and check whether it makes any difference.
If it still has same issue, you could also consider repair your VS 2015.
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Click Start, click Control Panel, and then click Programs.
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Click Programs and Features and then select the Visual Studio Edition you installed.
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Click Uninstall/Change.
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In the setup wizard, select Repair or Reinstall and then click Next.
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Follow the remaining instructions in the installation wizard to finish.
With regards,
Angie