Put the lines from a combobox into a textbox

textBox1.Multiline = True
Dim sb As New StringBuilder()
For Each item As String In comboBox1.Items
  sb.Append(item)
  sb.AppendLine()
Next item
textBox1.Text = sb.ToString()

mytextbox.Multiline = True

For i = 1 to Mycombobox.Items.Count
    mytextbox.Lines(i - 1) = Mycombobox.Items(i - 1)
Next

textBox1.Multiline = true;
            StringBuilder sb=new StringBuilder();
            foreach (string item in comboBox1.Items)
            {
                sb.Append(item);
                sb.AppendLine();
            }
            textBox1.Text = sb.ToString();