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Visual Studio bericht: Test connection failed because of an error in initializing provider. The given key was not present in the dictionary.
A family of Microsoft suites of integrated development tools for building applications for Windows, the web, mobile devices and many other platforms. Miscellaneous topics that do not fit into specific categories.
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please check the below link how to connect with each and every databases.
https://www.dofactory.com/connection-strings
first verify the link and check your connection string.
Thanks.