ช่วยหน่อยครับ การใช้ภาษไทยกับ MySql ด้วย C# ผมเขียนโปรแกรมแบบ Client Server ด้วย C# กับ Mysql ครับ

            string ConnectionString = "SERVER=localhost;" +
                                  "DATABASE=mydata;" +
                                  "UID=root;" +
                                  "PASSWORD=1234;" + "charset=tis620;";

            MySqlConnection connection = new MySqlConnection(ConnectionString);







            //Connecting to MySQL   
            connection.Open();
            MySqlCommand cmd = connection.CreateCommand();


            cmd.CommandText = "SELECT * FROM contact2_bk";
            cmd.CommandType = CommandType.Text;

            MySqlDataReader reader = cmd.ExecuteReader();
            string a = "";
            while (reader.Read())
            {
                Console.WriteLine(reader.GetString("FIRSTNAME").ToString());
                a = reader.GetString("FIRSTNAME").ToString();
            }

 < ?xml version="1.0" encoding="utf-8" ?>
 < configuration>
	< appSettings>
	  < add key="MyDataConnectionStringFromAppSettingSection" 
	  value="SERVER=localhost;DATABASE=mydata;UID=root;PASSWORD=1234;charset=tis620;"/>
    < /appSettings>

string ConnectionString =ConfigurationSettings.AppSettings("MyDataConnectionStringFromAppSettingSection")

MySqlConnection connection = new MySqlConnection(ConnectionString);

//Connecting to MySQL   
connection.Open();
MySqlCommand cmd = connection.CreateCommand();


cmd.CommandText = "SELECT * FROM contact2_bk";
cmd.CommandType = CommandType.Text;

MySqlDataReader reader = cmd.ExecuteReader();
string a = "";
while (reader.Read())
{
    Console.WriteLine(reader.GetString("FIRSTNAME").ToString());
    a = reader.GetString("FIRSTNAME").ToString();
}