The List Box Control

<summary>
Like a combobox, a list box displays a list of items. Listbox allows you to make either a single selection or multiple selection. Items in a listbox are indexed. The first item is at index 0.
The listbox contains an internal array called Items (same as combobox)
Adding items to and removing items from a listbox is done thru its Items array.    
The listbox has a property: Count. It's the number of items in the list.
Use the SelectedIndex to find out the index of the item selected.
The selectedIndex is equal to -1 if no item is selected.
Use the SelectedItem to find out the item selected
</summary>
        My Notes:
        There are 3 ways to input in listbox.
        One is: In [Design mode] click on ... (Property Items)
        Write ... anything you want
        eg. 
        Howard
        Steve
        Karen
        etc....

Selection Mode Property give 4 different ways to make selection (None, One, MultiSimple, MultiExtended)

namespace The_List_Box_Control
{

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //2nd way to input listbox
        private void Form1_Load(object sender, EventArgs e)
        {
            object[] names = {"Sara", "Bill", "Martin", "Susan", "Don"};
            listBox1.Items.AddRange(names);
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            string name = txtName.Text;
            if (name != String.Empty)
            {
                //listBox1.Items.Add(name);
                //txtName.Clear(); or
                //don't add if it is already in there.
                //add it only if it is not contained in the list
                if (!listBox1.Items.Contains(name))
                {
                    listBox1.Items.Add(name);
                    txtName.Clear();
                }
            }
        }

        private void btnGetSelection_Click(object sender, EventArgs e)
        {
            //get the selected index and selected item.
            //first check that an item is selected
            if (listBox1.SelectedIndex != -1)
            {
                richTextBox1.Text = "Selected Index: " + listBox1.SelectedIndex + "\n\n" + "Selected Item: " + listBox1.SelectedItem;
            }
        }

        private void btnRemovebyIndex_Click(object sender, EventArgs e)
        {
            int index = int.Parse(txtIndex.Text);
            if (index >= 0 && index < listBox1.Items.Count)
            {
                listBox1.Items.RemoveAt(index);
            }
        }
         //1. Complete Remove by Item
        private void btnRemovebyItem_Click(object sender, EventArgs e)
        {
            listBox1.SelectionMode = SelectionMode.MultiExtended;

            for (int i = listBox1.SelectedIndices.Count - 1; i >= 0; i--)
            {
                listBox1.Items.RemoveAt(listBox1.SelectedIndices[i]);
            }
        }

        //2. Add button to remove the Selected Item
        private void btnDeleteSelectItem_Click(object sender, EventArgs e)
        {
            string item = txtItem.Text;
            if (item != String.Empty)
            {
                listBox1.Items.Remove(item);
                txtName.Clear();
            }
        }
        //3. All button + Textboxes to insert new name at specified index
        private void btnInsert3_Click(object sender, EventArgs e)
        {
            int index3 = int.Parse(txtIndex3.Text);
            if (index3 >= 0)
            {
                string myname = txtName3.Text;
                if (myname != String.Empty)
                {
                    listBox1.Items.Insert(index3, myname);
                    txtName.Clear();
                }
            }
        }

    }
}
//1. Complete Remove by Item
//2. Add button to remove the Selected Item
//3. All button + Textboxes to insert new name at specified index