C# การใช้ DataGridViewComboBoxColumn ใน DataGridView แบบบ้าน ๆ

private System.Windows.Forms.DataGridViewComboBoxColumn dataGridViewTextBoxColumn3;
this.dataGridViewTextBoxColumn3 = new System.Windows.Forms.DataGridViewComboBoxColumn();
this.sett_Post_PostCodeDataGridView.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
            this.dataGridViewTextBoxColumn1,
            this.dataGridViewTextBoxColumn2,
            this.dataGridViewTextBoxColumn3,
            this.dataGridViewTextBoxColumn4,
            this.dataGridViewTextBoxColumn5,
            this.dataGridViewTextBoxColumn6});

 // dataGridViewTextBoxColumn3
            // 
            this.dataGridViewTextBoxColumn3.DataPropertyName = "Pnv";
            this.dataGridViewTextBoxColumn3.DataSource = this.sett_Post_ProvinceBindingSource;
            this.dataGridViewTextBoxColumn3.DisplayMember = "Province";
            this.dataGridViewTextBoxColumn3.HeaderText = "Pnv";
            this.dataGridViewTextBoxColumn3.Name = "dataGridViewTextBoxColumn3";
            this.dataGridViewTextBoxColumn3.Resizable = System.Windows.Forms.DataGridViewTriState.True;
            this.dataGridViewTextBoxColumn3.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.Automatic;
            this.dataGridViewTextBoxColumn3.ValueMember = "pvnID";

namespace TestDataBase
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void sett_Post_PostCodeBindingNavigatorSaveItem_Click(object sender, EventArgs e)
        {
            this.Validate();
            this.sett_Post_PostCodeBindingSource.EndEdit();
            this.tableAdapterManager.UpdateAll(this.postCodeDataSet);

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'postCodeDataSet.Sett_Post_PostOffice' table. You can move, or remove it, as needed.
            this.sett_Post_PostOfficeTableAdapter.Fill(this.postCodeDataSet.Sett_Post_PostOffice);
            // TODO: This line of code loads data into the 'postCodeDataSet.Sett_Post_Amphur' table. You can move, or remove it, as needed.
            this.sett_Post_AmphurTableAdapter.Fill(this.postCodeDataSet.Sett_Post_Amphur);
            // TODO: This line of code loads data into the 'postCodeDataSet.Sett_Post_Province' table. You can move, or remove it, as needed.
            this.sett_Post_ProvinceTableAdapter.Fill(this.postCodeDataSet.Sett_Post_Province);
            // TODO: This line of code loads data into the 'postCodeDataSet.Sett_Post_PostCode' table. You can move, or remove it, as needed.
            this.sett_Post_PostCodeTableAdapter.Fill(this.postCodeDataSet.Sett_Post_PostCode);

        }
    }
}

 // 
            // dataGridViewTextBoxColumn3
            // 
            this.dataGridViewTextBoxColumn3.DataPropertyName = "Pnv";
            this.dataGridViewTextBoxColumn3.DataSource = this.sett_Post_ProvinceBindingSource;
            this.dataGridViewTextBoxColumn3.DisplayMember = "Province";
            this.dataGridViewTextBoxColumn3.HeaderText = "Pnv";
            this.dataGridViewTextBoxColumn3.Name = "dataGridViewTextBoxColumn3";
            this.dataGridViewTextBoxColumn3.Resizable = System.Windows.Forms.DataGridViewTriState.True;
            this.dataGridViewTextBoxColumn3.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.Automatic;
            this.dataGridViewTextBoxColumn3.ValueMember = "pvnID";
            this.dataGridViewTextBoxColumn3.Width = 160;
            // 
            // dataGridViewTextBoxColumn4
            // 
            this.dataGridViewTextBoxColumn4.DataPropertyName = "Amp";
            this.dataGridViewTextBoxColumn4.DataSource = this.sett_Post_AmphurBindingSource;
            this.dataGridViewTextBoxColumn4.DisplayMember = "Amphur";
            this.dataGridViewTextBoxColumn4.HeaderText = "Amp";
            this.dataGridViewTextBoxColumn4.Name = "dataGridViewTextBoxColumn4";
            this.dataGridViewTextBoxColumn4.Resizable = System.Windows.Forms.DataGridViewTriState.True;
            this.dataGridViewTextBoxColumn4.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.Automatic;
            this.dataGridViewTextBoxColumn4.ValueMember = "amphID";
            this.dataGridViewTextBoxColumn4.Width = 150;
            // 
            // dataGridViewTextBoxColumn5
            // 
            this.dataGridViewTextBoxColumn5.DataPropertyName = "PosOff";
            this.dataGridViewTextBoxColumn5.DataSource = this.sett_Post_PostOfficeBindingSource;
            this.dataGridViewTextBoxColumn5.DisplayMember = "PostOffice";
            this.dataGridViewTextBoxColumn5.HeaderText = "PosOff";
            this.dataGridViewTextBoxColumn5.Name = "dataGridViewTextBoxColumn5";
            this.dataGridViewTextBoxColumn5.Resizable = System.Windows.Forms.DataGridViewTriState.True;
            this.dataGridViewTextBoxColumn5.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.Automatic;
            this.dataGridViewTextBoxColumn5.ValueMember = "poID";
            this.dataGridViewTextBoxColumn5.Width = 180;