An error occurred creating the configuration section handler for system.data: Column 'InvariantName' is constrained to be unique. Value 'MySql.Data.MySqlClient' is already present. (C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config line

Question

An error occurred creating the configuration section handler for system.data: Column 'InvariantName' is constrained to be unique. Value 'MySql.Data.MySqlClient' is already present. (C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config line 152) (System.Configuration)

Answer 1

Hey, I have same question.

I wonder why Microsoft SQL is so terrible. It required many downloaded and updated but It didn't work after downloaded.

Such a bad experience!!