open and edit multiple .csv files in c# -


my ideal : open .csv files (5 or 6 or more) , add 2 new columns opened files , save it. here code

openfiledialog fopen = new openfiledialog(); fopen.multiselect = true;                       fopen.filter = "(all type)|*.*"; fopen.showdialog(); if (fopen.filename != null) {     excel.application app = new excel.application();     excel.workbook wb = app.workbooks.open(fopen.filename);     excel.worksheet sheet = wb.sheets[1];     excel.range range = sheet.usedrange;      int column = range.columns.count;     int row = range.rows.count;      textbox1.text = fopen.filename;      //textbox2.text = row.tostring();     //textbox3.text = column.tostring();      range.cells.set_item(1, column + 1, "mo_stmoc");     range.cells.set_item(1, column + 2, "mo_stmoccpl");      (int = 2; <= row; i++)     {         range.cells.set_item(i, column + 1, "0");         range.cells.set_item(i, column + 2, "0");     }     wb.save();     wb.close();       app.workbooks.close();     app.quit(); }

the problem is, when open files , adding 2 columns in first .csv file. i'm new c#, doing wrong here?

you opening multiple files, loop through fopen.filenames instead of using fopen.filename

 foreach (string file in fopen.filenames)  {   //do thing   //edit }

additionally better filter csv files instead of all.

 fopen.filter = "csv files (*.csv)|*.csv";

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