How to Append Lines to a File Using C# StreamWriter?

Using C# StreamWriter to Add Lines to a File

Many C# developers encounter a common problem when using StreamWriter: instead of adding new lines to a file, the existing content is overwritten. This happens because StreamWriter defaults to overwriting the file. The solution lies in using a StreamWriter overload that allows you to specify whether you want to append or overwrite.

To append lines, create your StreamWriter instance like this:

<code class="language-csharp">StreamWriter file2 = new StreamWriter("c:\file.txt", true);</code>

For enhanced readability (especially in C# 4 and later versions), you can use this more explicit syntax:

<code class="language-csharp">StreamWriter file2 = new StreamWriter("c:\file.txt", append: true);</code>

With this method, StreamWriter will add your string to the end of the file, keeping the original lines intact and properly separated.

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