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How can you append lines to a file using StreamWriter without overwriting existing content?

Ravi Vishwakarma 642 08 May 2025

How can you append lines to a file using StreamWriter without overwriting existing content?

c# c#file handling
Updated 29 May 2025
Ravi Vishwakarma
Ravi Vishwakarma

IT-Hardware & Networking

Ravi Vishwakarma is a dedicated Software Developer with a passion for crafting efficient and innovative solutions. With a keen eye for detail and years of experience, he excels in developing robust software systems that meet client needs. His expertise spans across multiple programming languages and technologies, making him a valuable asset in any software development project.

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1 Answers

Ravi Vishwakarma
Ravi Vishwakarma 29 May 2025
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To append lines to a file using StreamWriter in C# without overwriting existing content, you need to pass append: true to the constructor.

Example: Append Lines Using StreamWriter

using System.IO;

string filePath = "example.txt";

using (StreamWriter writer = new StreamWriter(filePath, append: true))
{
    writer.WriteLine("This is a new line being appended.");
    writer.WriteLine("Another appended line.");
}

Explanation:

  1. append: true tells StreamWriter to open the file in append mode instead of overwriting it.
  2. If the file doesn't exist, it will be created automatically.
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