I need to view all possible paths in permutation of n numbers on listbox using C#

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C#5.0

i need that code which enable me only to show that possible paths between number of N numbers / nodes as a permutation andcombination,
only the ListBox code
..............................
thatis for permutation Button solving :

private void Btn_Permutation_Solve_Click(object sender, EventArgs e)
        {
            long n = 0, r = 0;
            long result;
            //int List_Result = 0;

            try
            {
                n = long.Parse(Txt_Permutation_Source.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("Invalid Number");
            }

            try
            {
                r = long.Parse(Txt_Permutation_Destination.Text);
                result = Operations_Class.Permutation(n, r);
                Txt_Permutation_Result.Text = result.ToString();
            }
            catch (FormatException)
            {
                MessageBox.Show("Invalid Number");
            }

--------------------------------
and that's for combination Button solving :

private void Btn_Combination_Solve_Click(object sender, EventArgs e)
        {
            long n = 0, r = 0;
            long result ;
            try
            {
             -   n = long.Parse(Txt_Combination_Source.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("Invalid Number");
            }
            try
            {
                r = long.Parse(Txt_Combination_Destination.Text);
                result = Operations_Class.Combination(n, r);
                Txt_Combination_Result.Text = result.ToString();
            }
            catch (FormatException)
            {

                MessageBox.Show("Invalid Number");
            }
            //----------------------------------------------------------------ListBox
            string JoinedLetters = Txt_Combination_Source.Text;
            List<char> SplitLetters = JoinedLetters.ToList();
            int WordLength = SplitLetters.Count;
            int[] Number = new int[WordLength];
            listBox1.DataSource = null;
            listBox1.Items.Clear();
            listBox1.Refresh();
            results = new List<string>();
            for (int Comb = 1; Comb <= WordLength; Comb++)
            {
                pCombinations = pCombinations * Comb;
            }
            string word = "";
            count = 0;
            permutations(WordLength, SplitLetters, word);
            listBox2.DataSource = results;
            progressBar1.Value = (int)(((count - 1) / pCombinations) * 100);

            }

--------------------------------------
but to show all of the operations happening before calculating the permutation and combination in a listbox, we have to edit that code under the comment
"//---------ListBox"
so what can i can do to perform that, your response already will be appreciated