Counting the number of items

guys need help i am new to asp.net programming and i cant figure out what could possibly the solution.

ihave two listboxes. the first one contains the items to be selected and added to the other listbox. When i click the add button, the program should count the items that was added on the second list box. I want to put the count in a textbox

here is the code: c#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page

{
int count = 0;
int x;
protected void Page_Load(object sender, EventArgs e)
{
if (!(IsPostBack)){
lst1.Items.Add("Red");
lst1.Items.Add("Blue");
lst1.Items.Add("Yellow");
lst1.Items.Add("Black");
}
}


protected void add(object sender, EventArgs e)
{
lst2.Items.Add(lst1.SelectedItem.Text);

count = count + 1;


}
protected void btnRemove_Click(object sender, EventArgs e)
{
lst2.Items.Remove(lst2.SelectedItem);

}

I don't use NET or C# but most MS objects have an index or count property. If no one jumps in here try the NET forum, this forum is mostly classic asp.