using System.IO; 
try{ 
StreamReader sf = new StreamReader("C:/filename.txt"); 
string readdata = ""; 

                while ((readdata = sf.ReadLine()) != null){ 
                Console.Out.WriteLine(readdata); 
                } 
sf.close(); 
} 

catch (IOException e){ 
Console.Out.WriteLine("Unable to open file:"); 
Console.Out.WriteLine("Error: "  + e.StackTrace); 
}