I load the reference MySql.Data and verify that this is loaded.
I place
using MySql.Data;
into my code, but it cannot find MySql.Data.
There are many versions of MySql.Data available and many solutions indicated for this in previous posts.
One possible cause is that the .NET Framework version is incompatible with the version of the MySql Connector/NET.
Check your version of the .NET Framework, since the Connector/NET only works up to .NET Framework 4.5.x and changing the version from 4.6 to 4.5.2 worked for me. (Project > Properties > Application > Target Framework).
REFERENCE: MySQL Versions