Actually, I bought a host for the site. There, through cPanel created a new SQL database.
I want to start at least to start to connect to it.
List<string> results = new List<string>(); SqlConnection conn = new SqlConnection("Data Source = myServerAddress; Initial Catalog = myDataBase; User Id = myUsername; Password = myPassword;"); using (SqlCommand command = new SqlCommand()) { command.Connection = conn; command.CommandType = CommandType.Text; command.CommandText = "Select myColumn from myTable"; using (SqlDataReader dr = command.ExecuteReader()) { while (dr.Read()) { results.Add(dr["myColumn"].ToString()); } } } I found this code in the same stackoverflow. Forged by itself -> issuing an error when connecting to the database.
How did I get the address: (I specified my external IP as a host) 
Help! Knowledge of SQL 0, or even -1.

"server=server IP; database=mydatabase; port=3306; user=myuser;"- tym32167