read a specific part of a text file into an ARRAY in C#

   private void btnSearch_Click(object sender, EventArgs e)
        {

            try
            {
                string path = Environment.CurrentDirectory + @"\TextFile1.txt";
                string TextData = File.ReadAllText(path);
                int[] x = new int[100];
               
                //Below Code Will Change the Matching pattern of Regex on SearchText Box 
                //this Will Match One Portion of the String 
               
                string CustomRegEx = txtSearchBox.Text.Trim() + "[/0-9 ]*/";
                Regex re = new Regex(CustomRegEx);
                
                //Collecti Founded  Matches in Match Collection 
                MatchCollection mc = re.Matches(TextData);

               // Now our Matched String is mc[0] from String 
                //Here Value of mc[0] will be "POROSITY / 5 10 15 30 50 60 78 80 90 100 150 /" 
                //Now we Only Have to do Operation on this String mc[0]
                //Below Replace will Remove the "POROSITY" Word From String 
                string SearchedString = mc[0].ToString().Replace(txtSearchBox.Text.Trim(), string.Empty);

                //Now Our String is "/ 5 10 15 30 50 60 78 80 90 100 150 /"
                //So We have to Remove '/' also so used Below Code
                string ExtractedNumbers = SearchedString.Replace("/", String.Empty);

                //Now our String After All Operation is : 5 10 15 30 50 60 78 80 90 100 150

                //By Split Operation we Split Eeach Number as Word in Array "NumberString"
                //It Will Be Like 
                //NumberStrins[0] = "5"
                //NumberStrins[0] = "10" ... continue..
                string[] NumbersStrings = ExtractedNumbers.Split(' ');
               
               // now We have all the Numbers as String in NumberString Array 
                // Just Convert It To integer and Add It To Array By Below Code
                int i = 0;
                listBox1.Items.Clear();
                listBox1.Items.Add(txtSearchBox.Text);
                listBox1.Items.Add("/");
                int counter = 0;
                string _newLine = string.Empty;
                foreach (string str in NumbersStrings)
                {
                    if (str != "")
                    {
                        int Number = int.Parse(str);

                        x[i] = Number;
                        if (counter<4)
                        {
                            _newLine += Number.ToString() + " ";
                            counter++;
                            i++;
                        }
                        else
                        {
                            listBox1.Items.Add(_newLine);
                            _newLine = string.Empty;
                            counter = 0;
                        }
                    }
                }
                listBox1.Items.Add("/");
            }
            catch
            {
                MessageBox.Show("No match Found !!");
            }
             
        }