how to read lines in a text file c# code example

Example 1: c# read file line by line

int counter = 0;  
string line;  
  
// 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++;  
}  
  
file.Close();  
System.Console.WriteLine("There were {0} lines.", counter);  
// Suspend the screen.  
System.Console.ReadLine();

Example 2: text file read all lines c#

using System;
using System.IO;
class Test
{
    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";

        // This text is added only once to the file.
        if (!File.Exists(path))
        {
            // Create a file to write to.
            string[] createText = { "Hello", "And", "Welcome" };
            File.WriteAllLines(path, createText);
        }

        // This text is always added, making the file longer over time
        // if it is not deleted.
        string appendText = "This is extra text" + Environment.NewLine;
        File.AppendAllText(path, appendText);

        // Open the file to read from.
        string[] readText = File.ReadAllLines(path);
        foreach (string s in readText)
        {
            Console.WriteLine(s);
        }
    }
}