How to find and store specific lines from a file in c# -

i want search lines containing specific data , store these data in list, how can this? have written code project, code can find , store first line containing wanted data because these lines started same structure, example, data repeated in lines 100, 250, 400, 660, , these lines stated "|prod |oil |" .

double[] oil_prdc   = new double[10]; double[] water_prdc = new double[10];                   double[] gas_prdc   = new double[10]; double[] water_injc = new double[10]; double[] gas_injc   = new double[10];   int length_time = 5; string[][] characters = new string[2391][]; string [] charss; string[][]counter = new string[20][]; while ((line = file.readline()) != null) {                         (int = 0; < length_time; i++)     {         total_production.add(null);         total_production[i] = new list<_5_points>();          while (line.contains("|prod    |oil     |"))         {             charss = line.split('|');              (int j = 0; j < charss.length; j++)             {                 if (j == 9)                 {                     oil_prdc[i] = 1000 * convert.todouble(charss[j]);                                                         }                 else if (j == 10)                 {                     water_prdc[i] = convert.todouble(charss[j]);                 }                 else if (j == 11)                 {                     gas_prdc[i] = 1000 * convert.todouble(charss[j]);                 }             }             count++;             if (count > charss.length) break;          }          while (line.contains(" |winj    |wat     "))         {             charss = line.split('|');             (int jj = 0; jj < charss.length; jj++)             {                 if (jj == 8)                 {                     water_injc[i] = 1000 * convert.todouble(charss[jj]);                 }             }             count++;             if (count > charss.length) break;         }         while (line.contains(" |ginj    |passive "))         {             charss = line.split('|');             (int ij = 0; ij < charss.length; ij++)             {                 if (ij == 9)                 {                     gas_injc[i] = 1000 * convert.todouble(charss[ij]);                 }             }             count++;             if (count > charss.length) break;         }         _5_points temp=new _5_points{oil_prd =oil_prdc[i],gas_prd=gas_prdc[i],water_prd=water_prdc[i],water_inj=water_injc[i],gas_inj=gas_injc[i]};         total_production[i].add(temp);     } } 

example of how read file:

try  {     // create instance of streamreader read file.     // using statement closes streamreader.     using (streamreader sr = new streamreader("testfile.txt"))      {         string line;         // read , display lines file until end of          // file reached.         while ((line = sr.readline()) != null)          {             console.writeline(line);         }     } } catch (exception e)  {     // let user know went wrong.     console.writeline("the file not read:");     console.writeline(e.message); } 

search specific text in each "line":

public static string getbetween(string strsource, string strstart, string strend) {     int start, end;     if (strsource.contains(strstart) && strsource.contains(strend))     {         start = strsource.indexof(strstart, 0) + strstart.length;         end = strsource.indexof(strend, start);         return strsource.substring(start, end - start);     }     else     {         return "";     } } 

how use it:

string text = "this example string , data here"; string data = getbetween(text, "my", "is");