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Home Interviews How can you write to a file using StreamWriter with async/await? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 08 May 2025
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You can write to a file asynchronously in C# using StreamWriter in combination with async and await. This helps prevent blocking, especially in UI or web applications.

Example: Asynchronous File Writing with StreamWriter

using System;
using System.IO;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        string filePath = @"C:\example.txt";

        try
        {
            using (StreamWriter writer = new StreamWriter(filePath, append: true))
            {
                await writer.WriteLineAsync("This is an async line written to the file.");
                await writer.WriteLineAsync("Another line added asynchronously.");
            }

            Console.WriteLine("Data written successfully.");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error writing file: " + ex.Message);
        }
    }
}

Key Points:

  1. append: true lets you add content without overwriting the file.
  2. Use await writer.WriteLineAsync(...) or await writer.WriteAsync(...) for async operations.
  3. Always wrap in try/catch for error handling.
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