DataGridView ช่วยหน่อยครับ C# and MySQL Font Thai Can't AS in thai font

private void PopulateData()
{
	//*** BindData From Database **'
	MySqlConnection objConn = default(MySqlConnection);
	MySqlDataAdapter dtAdapter = default(MySqlDataAdapter);
	DataTable dt = new DataTable();

	string strConnString = null;
	strConnString = "Server=localhost;User Id=root; Password=root; Database=mydatabase; Pooling=false";
	objConn = new MySqlConnection(strConnString);
	objConn.Open();

	string strSQL = null;
	strSQL = "SELECT * FROM customer";

	dtAdapter = new MySqlDataAdapter(strSQL, objConn);
	dtAdapter.Fill(dt);

	dtAdapter = null;
	objConn.Close();
	objConn = null;

	this.myDgv.DataSource = dt;

	//******************************'
	this.myDgv.Columns.Clear();

	var _with1 = myDgv.ColumnHeadersDefaultCellStyle;
	_with1.BackColor = Color.Navy;
	_with1.ForeColor = Color.White;
	_with1.Font = new Font(songsDataGridView.Font, FontStyle.Bold);

	DataGridViewTextBoxColumn ColumnTextBox = default(DataGridViewTextBoxColumn);




	//*** Column (Select) ***'
	DataGridViewCheckBoxColumn ColumnCheckBox = new DataGridViewCheckBoxColumn();
	ColumnCheckBox.Width = 30;
	ColumnCheckBox.DataPropertyName = "Select";
	this.myDgv.Columns.Add(ColumnCheckBox);

	//*** Checkbox in Header ***'
	CheckBox ckBox = new CheckBox();
	Rectangle rect = myDgv.GetCellDisplayRectangle(0, -1, true);
	ckBox.Size = new Size(18, 18);
	rect.X = rect.Location.X + (rect.Width / 4);
	ckBox.Location = rect.Location;
	ckBox.CheckedChanged += new EventHandler(ckBox_CheckedChanged);
	this.myDgv.Controls.Add(ckBox);

	myDgv.Columns(0).Frozen = false;

	//*** Column (CustomerID) ***'
	ColumnTextBox = new DataGridViewTextBoxColumn();
	ColumnTextBox.DataPropertyName = "CustomerID";
	ColumnTextBox.HeaderText = "CustomerID";
	ColumnTextBox.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
	ColumnTextBox.Width = 100;
	this.myDgv.Columns.Add(ColumnTextBox);

	//*** Column (Name) ***'
	ColumnTextBox = new DataGridViewTextBoxColumn();
	ColumnTextBox.DataPropertyName = "Name";
	ColumnTextBox.HeaderText = "Name";
	ColumnTextBox.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
	ColumnTextBox.Width = 100;
	this.myDgv.Columns.Add(ColumnTextBox);

	//*** Column (Email) ***'
	ColumnTextBox = new DataGridViewTextBoxColumn();
	ColumnTextBox.DataPropertyName = "Email";
	ColumnTextBox.HeaderText = "Email";
	ColumnTextBox.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
	ColumnTextBox.Width = 100;
	this.myDgv.Columns.Add(ColumnTextBox);

	//*** Column (CountryCode) ***'
	ColumnTextBox = new DataGridViewTextBoxColumn();
	ColumnTextBox.DataPropertyName = "CountryCode";
	ColumnTextBox.HeaderText = "CountryCode";
	ColumnTextBox.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
	ColumnTextBox.Width = 100;
	this.myDgv.Columns.Add(ColumnTextBox);

	//*** Column (Budget) ***'
	ColumnTextBox = new DataGridViewTextBoxColumn();
	ColumnTextBox.DataPropertyName = "Budget";
	ColumnTextBox.HeaderText = "Budget";
	ColumnTextBox.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
	ColumnTextBox.Width = 100;
	this.myDgv.Columns.Add(ColumnTextBox);

	//*** Column (Used) ***'
	ColumnTextBox = new DataGridViewTextBoxColumn();
	ColumnTextBox.DataPropertyName = "Used";
	ColumnTextBox.HeaderText = "Used";
	ColumnTextBox.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
	ColumnTextBox.Width = 100;
	this.myDgv.Columns.Add(ColumnTextBox);

}