Dim conn As MySqlConnection = New MySqlConnection(ServerString)
Dim cmd As MySqlCommand = New MySqlCommand
cmd.Connection = conn
Dim mb As MySqlBackup = New MySqlBackup(cmd)
I just want to thank everyone who tried to answer this question. That's why i love this site. I fixed this problem, by uninstalling and installing back visual studio. Then i installed MySqlBackup.NET (using NuGet package manager) Version 188.8.131.52, which automatically installed MySql.Data version 6.9.9. It works perfectly. I'm not saying that's best solution, but it works.
To whoever worked on MySqlBackup.NET. Gold bless his heart. It works flawlessly and so easy to use.