C# windows form project MySQL localhost issue

[Gennady Gurin]

Hi, I am using C# MySQL code in my windows form project.

I am using phpMyAdmin platform.

using System.Data.SqlClient;

MySqlConnection connection = new MySqlConnection("datasource=localhost;port=3306;username=MyUsernName;password=MyPassword");

I do INSERT and SEARCH, and it works only locally (meaning while I have logged into my PhpMyAdmin platform, but when I tested on another PC the connection to MySQL failed.
I am new to this, should I download this platform? I need to have remote MySQL connection from any PC worldwide. And what MySqlConnection should be?

Not sure where to download, any links would be helpful. How to create a database with a table there?

Is it free or they charge to use it?

Thanks in advance...