Unable to connect to my mysql database

Hello, I want to connect to MySQL database, but it doesn't want to connect.

I have bought Web Hosting and domain name at Truehoster.
I connected to cPanel and made the following things:
- I created a new database
- I created a user with all privileges
- I went to Remote MySQL and added my IP

I tried to connect with many programs and applications but was unsuccessful.

I have a c# script for testing. The code is here if you need it but it works because I had no problems to connect with my program to one of free MySQL database from freemysqlhosting.

I get this error when I use my database from Truehoster:

Or in some programs or applications, it is just connecting forever.
I'm pretty sure I put the correct database name, username, and password.

My C# program:

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MySql.Data;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string serverIp = "ns111.truehoster.net";
            string databaseName = "my-database-name";
            string username = "user";
            string password = "password";

            string createTableQuery = string.Format(@"CREATE TABLE `{0}` (
               `sid` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
               `name` varchar(120) NOT NULL DEFAULT '',
               `title` varchar(120) NOT NULL DEFAULT '',
               `description` text NOT NULL,
               `optionscode` text NOT NULL,
               `value` text NOT NULL,
               `disporder` smallint(5) unsigned NOT NULL DEFAULT '0',
               `gid` smallint(5) unsigned NOT NULL DEFAULT '0',
               `isdefault` tinyint(1) NOT NULL DEFAULT '0',
               PRIMARY KEY (`sid`),
               KEY `gid` (`gid`))
               ENGINE = MyISAM AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8;", "TestTable1");
 
            string dbConnectionString = string.Format("server={0};uid={1};pwd={2};database={3};", serverIp, username, password, databaseName);

            try
            {
                MySql.Data.MySqlClient.MySqlConnection conn = new MySql.Data.MySqlClient.MySqlConnection(dbConnectionString);
                conn.Open();

                var cmd = new MySql.Data.MySqlClient.MySqlCommand(createTableQuery, conn);
                cmd.ExecuteNonQuery();

                Console.WriteLine("done");
            }
            catch (Exception)
            {
                Console.WriteLine("nope");
                throw;
            }
            Console.ReadKey();
        }

    }
}

If this helps when I put some random host, for example, ns111.truehoster.com it gives me this error(2), but if I put incorrect username and or password It doesn't change anything (it shows the first error).

Error(2):

I'm really confused about this problem and don't know what I'm doing wrong.
So I would be really grateful for any help.