Visual Studio 2017 the connection string could not be found in application settings

Question

For connection database and reading data, I am using a dataset which read connection string from Web.config file. Everything working in Visual Studio 2013. But when I opened this project in Visual Studio 2017, I can't configure. It errors:

Unable to find connection string xxxx. the connection string could not be found in application settings or the data provider associated with the connection string could not be loaded

Answer 1

Update the VS to 15.9. This will fix the existing problem