// To save the text as one string use 'ReadAllText()'
string text = System.IO.File.ReadAllText(@"C:\filepath\file.txt");
// To save each line seperately in an array use 'ReadAllLines()'
string[] lines = System.IO.File.ReadAllLines(@"C:\filepath\file.txt");
// Read the file and display it line by line.
System.IO.StreamReader file =
new System.IO.StreamReader(@"c:\test.txt");
while((line = file.ReadLine()) != null)
{
System.Console.WriteLine(line);
counter++;
}