How to Append a Single Line to an Existing Text File in .NET?

Efficiently Adding a Line to an Existing Text File in .NET

.NET offers streamlined methods for modifying text files. A common task is adding a new line to an existing file. The File.AppendAllText method provides a simple solution.

This method opens the target file, adds the specified text to the end, and automatically closes the file.

Here's how to use it:

File.AppendAllText(@"c:\path\file.txt", "text content" + Environment.NewLine);

Let's break down this code:

• File.AppendAllText: This is the core method for appending.
• @"c:pathfile.txt": This is the full path to your text file. Note the use of the @ symbol for a verbatim string literal, avoiding the need to escape backslashes.
• "text content" Environment.NewLine`: This is the text you want to append. Environment.NewLine ensures the correct line ending for your operating system.

File.AppendAllText simplifies the process, eliminating the need for manual file opening, writing, and closing, or complex string manipulation. It's the most efficient approach for appending a single line.

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