ListBox1.Items.Clear(); Does not work in Generic Collection

Question

hi friends how are you..........
Today I have 2 Questions...
(1)
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ListBox1.Items.Clear(); not work on Generic collection Example.
I have tried 2 example 1)List<string>
                                  2)LinkedList<string>


Code of First Example are:

  listBox1.Items.Clear();

            //lst.Clear();

            for (int i = 0; i < lst.Count; i++)

            {

                listBox1.Items.Add(lst[i]);

            }

   private void button1_Click(object sender, EventArgs e)

        {

            lst.Add("Red");

            lst.Add("green");

            lst.Add("blue");

            lst.Add("pink");

            lst.Add("lemon");

            LoadMyList();

            button2.Enabled = true;

            button3.Enabled = true;

            button4.Enabled = true;

        }
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(2)
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I have seen both List<T> and LinkedList<T> Example but never found any difference in both so questiion are what are the difference in both.If Possible Please gave an Example.