C# phpMyAdmin อ่านภาษาไทยไม่ได้ เป็นเครื่องหมายคำถาม ???????

 public Form2()
        {
            InitializeComponent();
            
            server = "localhost";
            database = "db2";
            uid = "root";
            password = "root";
            string connectionString;
            connectionString = "Server=localhost;User Id=root; Password=1234; Database=db2; Pooling=false";

            connection = new MySqlConnection(connectionString);
            connection.Open();
        }
private void button1_Click(object sender, EventArgs e)
        {
            
            MySql.Data.MySqlClient.MySqlCommand objCmd;
            String date = dateTimePicker1.Text;
            String re_date = dateTimePicker2.Text;
            String re_p = null;
            String pay=null;
            //recive
            if (radioButton1.Checked)
                re_p = "this place";
            else if (radioButton2.Checked)
                re_p = "Fax";
            else
                re_p = "post";
            //Payment
            if (comboBox1.SelectedIndex == 0)
                pay = "money";
            else if (comboBox1.SelectedIndex == 1)
                pay = "receipt";
            else if (comboBox1.SelectedIndex == 2)
                pay = "transfer";
            else if (comboBox1.SelectedIndex == 3)
                pay = "unpaid";
            
            //command insert
            String strSQL = "insert into profile values('" + ID.Text.Trim() + "','" + date + "','" + name.Text.Trim() + "','" + adr.Text.Trim() + "','" + tel.Text.Trim() + "','" + fax.Text.Trim() + "','" + mail.Text.Trim() + "','" + obj.Text.Trim() + "','" + num.Text.Trim() + "','" + syn.Text.Trim() + "','" + namet.Text.Trim() + "')";
            //cmd.Connection = connection;

            objCmd = new MySql.Data.MySqlClient.MySqlCommand();
            objCmd.Connection = connection;
            objCmd.CommandText = strSQL;
            objCmd.ExecuteNonQuery();
MessageBox.Show("complete");
            connection.Close();
        }