c# - Reading line by line from textfile -

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I have a function in the C # class that is reading a text file in the streamfile. Here is the C # function. 

  public readFile (string filename, long startPosition = 0) {// open file as file _fileStream = new file stream (filename, filemod. Open, fileAccess.read, fileshare.readwrite ); _reader = New Stream Reader (_fileStream); // Set Start position _fileStream. Composition = startposition; }   
 And I am trying to call this function in another category and read the file line by line.  
  Private AddContentReader _freader; Protected override zero (string [] Args) {_freader = New Added Content Reader (File); }   
 So my question is how to read text file by row in the calling function  
 Please help me ..   
 
 
  is a method called  readLine  in the streamrider  category.  
 sample  
  string line; While ((line = _reader.ReadLine ()) = null) {console.light line (line); }   
 More info  
     
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