Custom user control show as a dropdown in datagridview combo box column C#

// 1. Create new project
// 2. Add DataGridView Control to your Form
// 3. Add the following code:

private void AddData()
{
// Add Columns
dataGridView1.ColumnCount = 3;
dataGridView1.Column[0].Name = "Name";
dataGridView1.Column[1].Name = "DOB";
dataGridView1.Column[0].Name = "Tel";

// Add Rows
ArrayList row = new ArrayList();
row.Add("Ahmed");
row.Add("1/1/1990");
row.Add("22332344334");
dataGridView1.Rows.Add(row.ToArray());

// Add second Row
ArrayList row = new ArrayList();
row.Add("Mohamed");
row.Add("1/1/1998");
row.Add("2233234111");
dataGridView1.Rows.Add(row.ToArray());

// Add ComboBoxColumn
DataGridViewComboBoxColumn comboBox1 = new DataGridViewComboBoxColumn();
comboBox1.Name = "comboBox1";
comboBox1.HeaderText = "Job";
row = new ArrayList();
row.AddRange(new String[] {Teacher, Engineer, HouseKeeper, Doctor});
comboBox1.Items.AddRange(row.ToArray());
dataGridView1.Columns.Add(comboBox1);
}


// in the Form Load Event type the following code
private void Form1_Load(object sender, EventArgs e)
{
Add Data();
}

ComboBox comboBox1;

// in EditingControlShoing Event of DataGridView type the following code
private void dataGridView1_EditingControlShowig(object sender, DataGridViewEditingControlShowig e)
{
comboBox1 = e.Control as ComboBox;
if (comboBox1 != null)
{
comboBox1.SelectedIndexChanged -= new EventHandler(comboBox1_SelectedIndexChange);
comboBox1.SelectedIndexChanged += comboBox1_SelectedIndexChange;
}
}


private void comboBox1_SelectedIndexChange(object sender, EventArgs e)
{
string messageTest = (sender as ComboBox).SelectedItem.ToString();
MessageBox.Show(messageTest);
}

// Good Luck