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I came across an issue after updating my Visual Studio version to 15.5.3 which would cause my solution to throw an exception whenever it tried to access the database.
System.IO.FileLoadException: 'Could not load file or assembly 'System.Data.SqlClient, Version=4.2.0.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)'
The fix for this is nice and easy, you just need to install the NuGet (V4.4.2) package System.Data.SqlClient.
About the author
Aaron Sadler
Aaron Sadler, Umbraco MVP (2x), Umbraco Certified Master Developer and DevOps Engineer