[Source] Unable to cast to [B]MySql.Data.MySqlClient.MySqlConnection

[A] MySql.Data.MySqlClient.MySqlConnection cannot be cast to [B]MySql.Data.MySqlClient.MySqlConnection. Type A derives from "MySql.Data, version=6.9.9.0, culture=neutral, PublicKeyToken=c5687fc88969c44d" (in the context "Default" "C:\Windows\Microsoft.Net\assembly\GAC_MSIL\MySql.Data\v4.0_6.9.9.0___ c5687fc88969c44d\MySql.Data.dll" position). Type B derives from "MySql.Data, version=6.9.12.0, culture=neutral, PublicKeyToken=c5687fc88969c44d" ("C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET in the context "Default" files\vs\c0130247\48af6f4f\assembly\dl3\2f07d3eb\003370fc_75ddd301\MySql.Data.dll").