Implementar el auto-completar en un ComboBox

private void ComboBox1_TextChanged(object sender, EventArgs e)
{
     if (this.ComboBox1.FindString(this.ComboBox1.Text) > 0)
     {
         int pos = this.ComboBox1.Text.Length;
         this.ComboBox1.SelectedIndex = this.ComboBox1.FindString(this.ComboBox1.Text);
         this.ComboBox1.SelectionStart = pos;
         this.ComboBox1.SelectionLength = this.ComboBox1.Text.Length - pos;
     }
}