string text = System.IO.File.ReadAllText(@"C:\Users\Public\TestFolder\WriteText.txt");

System.Console.WriteLine("Contents of WriteText.txt = {0}", text);

int counter = 0;  
string line;  
  
System.IO.StreamReader file =   
    new System.IO.StreamReader(@"c:\test.txt");  
while((line = file.ReadLine()) != null)  
{  
    System.Console.WriteLine(line);  
    counter++;  
}  
  
file.Close();  
System.Console.WriteLine("There were {0} lines.", counter);  

string[] lines = System.IO.File.ReadAllLines(@"C:\Users\Public\TestFolder\WriteLines2.txt");

System.Console.WriteLine("Contents of WriteLines2.txt = ");
foreach (string line in lines)
{
    Console.WriteLine("\t" + line);
}