CSHARP

c# open file

System.Diagnostics.Process.Start(filePath);

c# file read

using(StreamReader file = new StreamReader(textFile)) {  
 int counter = 0;  
 string ln;  
  
 while ((ln = file.ReadLine()) != null) {  
  Console.WriteLine(ln);  
  counter++;  
 }  
 file.Close();  
}