c# - How to delete entry from file -

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try delete entry csv file, if know part of string code

 //open file         filestream fs = new filestream(filepath, filemode.open,              fileaccess.readwrite);         streamreader sr = new streamreader(fs);              //divide file entry separate lines         string []line = sr.readtoend().split(new string[] { environment.newline }, stringsplitoptions.removeemptyentries);  // find required entry , create new list without         list<string> finaldata = new list<string>();         foreach (var l in line)         {             if (!line.contains((datetimepicker1.text.tostring().trim() + ','+ eventnamedeletetextbox.text.tostring().trim()+',')))                 finaldata.add(l);         }   // convert array         string tocsvoutput = string.join(environment.newline, finaldata.toarray());       //  viewtextbox1.text=tocsvoutput;           //updatefile         sr.close();         filestream fs1 = new filestream(filepath, filemode.open,fileaccess.write, fileshare.none);         streamwriter sw = new streamwriter(fs1);         sw.writeline(tocsvoutput);         sw.close();

as result - nothing heppend, i'm wrong?

replace line l:

  if (!l.contains((datetimepicker1.text.tostring().trim() + ','+      eventnamedeletetextbox.text.tostring().trim()+',')))      finaldata.add(l);

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