How to loop data (or the best logic) to generate output

so i have a data(in .txt)

```

ABC@ID@550656019@IDR@2667378@[email protected]

INV@======================================================================

INV@REFERENCE AMOUNT

INV@956VII2019 2,667,378

INV@TOTAL INVOICE 2,667,378

DEF@ID@550656019@IDR@100186049|[email protected]

INV@======================================================================

INV@REFERENCE AMOUNT

INV@A019128B 2,726,903

INV@A019206 3,119,665

INV@A019126 6,296,663

INV@A019138 6,405,257

INV@A019036 6,700,000

INV@19149 7,101,957

INV@A019128A 9,171,400

INV@A019164 9,814,861

INV@A019168 12,638,424

INV@19109 12,675,303

INV@A018928 23,535,617

INV@TOTAL INVOICE 100,186,049

ABC@ID@550656019@IDR@97160972@[email protected]

INV@======================================================================

INV@REFERENCE AMOUNT

INV@190700185 2,786,589

INV@190700184 10,191,000

INV@190700164 11,844,283

INV@190700218 11,930,350

INV@190700165 19,017,750

INV@190700163 41,391,000

INV@TOTAL INVOICE 97,160,972

```

how to process the data so i can get the output like :

```

0|ABC|550656019|99828350|2

1|ABC|[email protected]

2|956VII2019|2667378

1|ABC|[email protected]

2|190700185|2,786,589

2|190700184|10,191,000

2|190700164|11,844,283

2|190700218|11,930,350

2|190700165|19,017,750

2|190700163|41,391,000

0|DEF|550656019|100186049|1

1|DEF|[email protected]

2|A019128B|2,726,903

2|A019206|3,119,665

2|A019126|6,296,663

2|A019138|6,405,257

2|A019036|6,700,000

2|19149|7,101,957

2|A019128A|9,171,400

2|A019164|9,814,861

2|A019168|12,638,424

2|19109|12,675,303

2|A018928|23,535,617

```

Explanation :

```

0 is for header

it will check if the data ( not the row with invoice) has the same field or not ( field 1("ABC") - field 4("IDR")) if yes, it will total the amount of the total invoice , and count the total record who has the same field

so the format will be "0|field1|field3|total invoice amount|total record"

1 is for detail

it will list the detail of the header -> you can check that each row has different email , the detail will be split between the email.

2 is for invoice detail

just list the Invoice (after references) and the amount , but not the total invoice

after you put the detail for one email , it will list the invoice then it will start to list the detail with different emails

```

im already stuck here and already try to convert .txt to .xlsx(hope it will be easier) but its not , im stuck at the logic and maybe you guys can help

Code to convert to xlsx

```

//string[]

var lines = File.ReadAllLines(textBox1.Text);

//read line then split

xlApp = new excel.Application();

xlWb = xlApp.Workbooks.Add();

xlWs = (excel.Worksheet)xlWb.Worksheets.get_Item(1);

row = 1;

col = 1;

for (int i = 0; i < lines.Length; i++)

{

textsplit = lines[i].Split('@');

for (int j = 0; j < textsplit.Length; j++)

{

try

{

xlWs.Cells[row, col] = textsplit[j].ToString();

col++;

}

catch (Exception ex)

{

}

}

row++;

col = 1;

}

//save ke file excel tampungan

xlWb.SaveAs(appPath + "testing.xlsx", excel.XlFileFormat.xlOpenXMLWorkbook, missing, missing,

false, false, excel.XlSaveAsAccessMode.xlNoChange, missing, missing, missing, missing, missing);

xlWb.Close();

closeExcel(xlApp); closeExcel(xlApp);

textBox2.Text = appPath + "testing.xlsx";

//ambil field penting dan dimasukkkan ke .txt

```

Thanks for the help