Disappearing Dynamic ComboBox - combobox

Question

Created the following code to workout some bugs in a bigger program. That said, when I click the button to add a row, the next row is added, but the previously created ComboBox (cmboPhoneType) disappears with each new click. What am I missing how to correct? Does this maybe have something to do with the name of the control?
using System;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace AddNewRowTest
{
public partial class Form1 : Form
{
int leftControl = 1;
ComboBox cmboPhoneType = new ComboBox();
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
addLabels();
btn_AddRow.PerformClick();
}
private void btn_AddRow_Click(object sender, EventArgs e)
{
//Connection Information redacted
reConn.Open();
MySqlCommand phoneTypeCommand = new MySqlCommand("Select * from lutable_phonetype order by Type;", reConn);
MySqlDataAdapter phoneTypeAdapter = new MySqlDataAdapter();
DataTable phoneTypeTable = new DataTable();
phoneTypeAdapter.SelectCommand = phoneTypeCommand;
phoneTypeAdapter.Fill(phoneTypeTable);
this.Controls.Add(cmboPhoneType);
cmboPhoneType.Top = leftControl * 36;
cmboPhoneType.Left = 12;
cmboPhoneType.Size = new Size(100, 20);
cmboPhoneType.DataSource = phoneTypeTable;
cmboPhoneType.DisplayMember = "Type";
cmboPhoneType.ValueMember = "TypeID";
cmboPhoneType.DataBindings.Add("SelectedValue", phoneTypeTable, "TypeID");
cmboPhoneType.SelectedIndexChanged += new System.EventHandler(cmboPhoneType_SelectedIndexChanged);
MaskedTextBox msktxtPhone = new MaskedTextBox();
this.Controls.Add(msktxtPhone);
msktxtPhone.Top = leftControl * 36;
msktxtPhone.Left = 116;
msktxtPhone.Size = new Size(100, 20);
msktxtPhone.Mask = "[phone]";
reConn.Close();
leftControl++;
}
private void addLabels()
{
Label lblPhoneType = new Label();
this.Controls.Add(lblPhoneType);
lblPhoneType.Top = leftControl * 12;
lblPhoneType.Left = 12;
lblPhoneType.Text = "Phone Type";
Label lblPhoneNumber = new Label();
this.Controls.Add(lblPhoneNumber);
lblPhoneNumber.Top = leftControl * 12;
lblPhoneNumber.Left = 116;
lblPhoneNumber.Text = "Phone Number";
}
private void cmboPhoneType_SelectedIndexChanged(object sender, EventArgs e)
{
cmboPhoneType.DataBindings.Clear();
}
}
}

Answer 1

Your Adding a "New" Masked Text Box in your Click Event but no "New" Combo Box. Then after you Declare a new cmbophonetype you will need to move, this.Controls.Add(cmboPhoneType); down, to just before you add the SelectedIndexChanged event handler. That will keep the Combobox visible but you may have some more problems separating all of the events.