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Do you mean files whose extensions are '.TXT'?<br />
First, I would enumerate the folder and all child objects which are not links or junctions.<br />
Filter this collection by items of whose suffix matches the suffix you're looking for.<br />
Check to see if you have permissions to write to the filtered file objects in the collection.<br />
Use the <br />
<br />

<pre><code id="code-20-42504553-1">public static StreamWriter AppendText(
	string path
)</code></pre>
<br />
where <b>path</b> is the path to the file and append the string in question.
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Do you mean files whose extensions are '.TXT'?
First, I would enumerate the folder and all child objects which are not links or junctions.
Filter this collection by items of whose suffix matches the suffix you're looking for.
Check to see if you have permissions to write to the filtered file objects in the collection.
Use the



public static StreamWriter AppendText(
	string path
)


where path is the path to the file and append the string in question.

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Yup,I mean the the files whose extension is .txt
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Yup,I mean the the files whose extension is .txt

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<div class="content wysiwyg-content">
I want to make a Windows application form that should select a particular folder and then append or overwrite all the text files that are discovered after recursively searching for text files by &quot;hello world&quot; text. All the discovered text files must then contain &quot;hello world&quot; as their content.how to do it in c#?
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I want to make a Windows application form that should select a particular folder and then append or overwrite all the text files that are discovered after recursively searching for text files by "hello world" text. All the discovered text files must then contain "hello world" as their content.how to do it in c#?

Recursively finding text files within a specified folder and appending its contents

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft. It is used to develop computer programs for Microsoft Windows, as well as web sites, web applications and web services. Visual Studio uses Microsoft software development platforms such as Windows API, Windows Forms, Windows Presentation Foundation, Windows Store and Microsoft Silverlight. It can produce both native code and managed code.