Connection string for MYSQL

using MySql.Data.MySqlClient;

 public MySqlActivity(string DatabaseName)

            {

                ConnectionString = "Data Source=localhost;Database=" + DatabaseName + ";    UserId=root;Password=; charset='utf8'";

            }

            public MySqlActivity(string DatabaseServer, string DatabaseName)

            {

                ConnectionString = "Data Source=" + DatabaseServer + ";Database=" + DatabaseName + "; UserId=root;Password=";

            }

            public MySqlActivity(string DatabaseServer, string DatabaseName, string UserId, string Password)

            {

                ConnectionString = "Data Source=" + DatabaseServer + ";Database=" + DatabaseName + "; UserId=" + UserId + ";Password=" + Password + "";

            }