C# StreamReader for Reading file

In C#, reading a file using the StreamReader class is simple.

Example- 

Here is a simple example to read data from text file using StreamReader class in C#,

using System;
using System.IO;
class Program
{
   static void Main()
   {
       // Specify the file path
       string filePath = "sample.txt";
       // Check if the file exists in the location
       if (File.Exists(filePath))
       {
           // Creating a StreamReader instance to read from the file
           using (StreamReader reader = new StreamReader(filePath))
           {
               // Read the file line by line
               string line;
               while ((line = reader.ReadLine()) != null)
               {
                   // Print each line to the console
                   Console.WriteLine(line);
               }
           }
       }
       else
       {
           Console.WriteLine("File not found: " + filePath);
       }
       Console.ReadLine();
   }
}

In the above example-

• Specifies the file path of the file we want to read (sample.txt).
• We use File.Exists(filePath) to check if the file exists.
• If the file exists, we create a StreamReader instance named reader and pass the file path to its constructor.
• We use a while loop to read a file line using the ReadLine() method of the StreamReader instance.
• In the loop, we print each line to the console.
• The transaction ensures that the StreamReader is properly disposed of after use, which locks the file and frees any associated objects.

Output- 

Hello, world!
This is a test.
Writing sample text to a file using C# StreamWriter class.

Also, Read: How to write file using StreamWriter in C#?